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Hgst Inc patents (2015 archive)


Recent patent applications related to Hgst Inc. Hgst Inc is listed as an Agent/Assignee. Note: Hgst Inc may have other listings under different names/spellings. We're not affiliated with Hgst Inc, we're just tracking patents.

ARCHIVE: New 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 | Company Directory "H" | Hgst Inc-related inventors


12/31/15 / #20150380059

Hanging carrier for hdd

A vibration isolating hard disk drive carrier for isolating the transfer of vibration from one hard disk drive to another comprising a carrier body and one or more isolation hangers is disclosed. The carrier has a first surface configured to couple to inherent features of a first external surface of a hard disk drive, and a second surface configured to couple to inherent features of a second external surface hard disk drive. ... Hgst Inc

12/31/15 / #20150380035

Head gimbals assembly, method for manufacturing thermal-assisted magnetic recording and manufacturing equipment of thermal-assisted magnetic recording

Embodiments of the present invention generally relate to a hamr head. The hamr head includes an anti-reflecting (ar) coating on a side opposite (e.g., a flex side) of the air bearing surface (abs). ... Hgst Inc

12/31/15 / #20150380031

Integrated compound dbr laser for hamr applications

Embodiments disclosed herein generally relate to a magnetic write head including a media facing surface and a surface opposite the media facing surface. The magnetic write head further includes a reflector extending from the surface opposite the media facing surface toward the media facing surface. ... Hgst Inc

12/31/15 / #20150380027

Transducer resistor shunt structure for low-cost probing

Embodiments described herein generally relate to resistive shunt design in a read sensor for providing accurate measurements from an electronic lapping guide (elg). More specifically, embodiments described herein relate to a transducer resistor shunt structure for low cost probing. ... Hgst Inc

12/31/15 / #20150380017

Partial main pole lamination for pole erasure improvement

The embodiments of the present invention relate to a magnetic write head and a method for forming the magnetic write head. The magnetic write head includes a partially laminated main pole that has a magnetic layer that is recessed from a media facing surface, a nonmagnetic spacer layer disposed on and adjacent to the magnetic layer and a laminated stack disposed on at least a portion of the nonmagnetic layer. ... Hgst Inc

12/31/15 / #20150378937

Systems and methods for locking cached storage

The present disclosure relates to systems and methods for locking a storage device to prevent inadvertent modification when the device is mounted on a different system or different host. The method can include selecting, on a storage device, a location and contents of a byte region for locking, where the byte region comprises a boot sector of the device. ... Hgst Inc

12/31/15 / #20150378925

Invalidation data area for cache

The present disclosure relates to caches, methods, and systems for using an invalidation data area. The cache can include a journal configured for tracking data blocks, and an invalidation data area configured for tracking invalidated data blocks associated with the data blocks tracked in the journal. ... Hgst Inc

12/31/15 / #20150378621

Enhanced data verify in data storage arrays

To provide enhanced operation of data storage devices and systems, various systems, methods, and software are provided herein. In a first example, a data storage system is configured to provide at least a portion of a first data storage device as a verification cache for a storage region of a second data storage device, write data for storage in the verification cache of the first data storage device and write the data for storage in the storage region of the second data storage device. ... Hgst Inc

12/24/15 / #20150372226

Variable selectivity silicon growth process

The present invention is a means and a method for speeding up the fabrication process, lowering the cost and improving yields. The present invention is a method for manufacturing memory cells in a diode memory array by utilizing selective epitaxial growth techniques to form high quality silicon for diodes and then lesser quality silicon to fill recesses and prepare the surface for subsequent planarization or etching steps.. ... Hgst Inc

12/24/15 / #20150371714

Word-line inter-cell interference detector in flash system

Read signals are obtained from memory cells, and a first read signal and a second read signal are identified, from among the plurality of read signals. The first read signal is associated with a first memory cell in a first word line and the second read signal is associated with a second memory cell in a second word line, and the second word line is adjacent to the first word line. ... Hgst Inc

12/24/15 / #20150371675

Hard disk drive low profile disk clamp to tied-shaft motor assembly

A hard disk drive is described, including a low-profile disk clamp to tied-shaft spindle/spindle motor assembly, in which a clamping nut is threaded onto a threaded spindle sleeve and a stationary shaft screw, or tied-shaft, penetrates through the hdd cover and into a shaft. The disk clamp may include a central opening for centering about the sleeve by way of the outer diameter of the clamping nut mating with the outer diameter of the clamp opening.. ... Hgst Inc

12/24/15 / #20150370822

Method and system for hash key memory reduction

A system and method are disclosed for storing data in a hash table. The method includes receiving data, determining a location identifier for the data wherein the location identifier identifies a location in the hash table for storing the data and the location identifier is derived from the data, compressing the data by extracting the location identifier; and storing the compressed data in the identified location of the hash table.. ... Hgst Inc

12/17/15 / #20150364202

Inter-cell interference algorithms for soft decoding of ldpc codes

Aspects of the subject technology relate to a method for reading information stored in a flash memory device. In some implementations, the method can include steps including, obtaining a first read signal of a first cell, wherein the first cell is located in a first word line and in a first bit line in the flash memory device, obtaining a programming level of a second cell, wherein the second cell is located in a second word line and in the first bit line, and wherein the second word line is adjacent to the first word line. ... Hgst Inc

12/17/15 / #20150364155

Dampers for actuator assembly of hard disk drive

An actuator assembly for a magnetic storage device includes a top surface and a bottom surface that opposes the top surface. The actuator assembly also includes a first constraining layer that is secured to the top surface by a first adhesive layer. ... Hgst Inc

12/17/15 / #20150363263

Ecc encoder using partial-parity feedback

Ecc encoders that process packets of p bits (with p>1) in a data block in parallel and generate a set of n parity/check bits that are stored along with the original data in the memory block. Encoders according to the invention can be used to create a nonvolatile nand flash memory write cache with bch-ecc for use in a disk drive that can speed up the response time for some write operations. ... Hgst Inc

12/10/15 / #20150359115

Storage canister with multiple storage device mounting elements

A storage canister is provided. The storage canister in one example includes an enclosure, multiple hard disk drives (hdds) located within the enclosure, a plurality of mounting elements configured to receive the multiple hdds, wherein each mounting element of the plurality of mounting elements is configured to receive a hdd, a plurality of suspension elements supporting the plurality of mounting elements, with each suspension element of the plurality of suspension elements supporting and providing vibration isolation to a corresponding hdd of the multiple hdds, and an external connector configured to be externally accessible, with the external connector being electrically coupled to the plurality of mounting elements.. ... Hgst Inc

12/10/15 / #20150355685

Sealed storage canister

A sealed storage canister is provided. The sealed storage canister in one example includes a sealed enclosure configured to be substantially hermetically sealed for retaining a predetermined gas or gas mixture, multiple unsealed hard disk drives (hdds) located within the sealed enclosure, with the multiple unsealed hdds configured to allow the predetermined gas or gas mixture to move through the multiple unsealed hdds, at least one mounting element configured to receive the multiple hdds, and an external connector configured to be externally accessible, with the external connector being directly or indirectly electrically coupled to the multiple unsealed hdds.. ... Hgst Inc

12/03/15 / #20150348577

Reducing ion migration in a hard disk drive microactuator flexure assembly

Approaches to a suspension for a hard disk drive include having an adhered one or more piezo actuating device driven by a negative bias driving voltage. The negative bias driving voltage is lower than ground, therefore such voltage inhibits the migration of ions of an electrically conductive adhesive to an electrically conductive flexure layer, and inhibits the degradation of the resistance of an insulating material positioned between the conductive adhesive and the conductive flexure layer.. ... Hgst Inc

12/03/15 / #20150348576

Hard disk drive suspension dimple

Approaches to a suspension for a hard disk drive (hdd) include a non-hemispherical dimple for movably coupling a flexure with a load beam, where the length of the non-hemispherical dimple exceeds the width. Therefore, in the context of a microactuator system, piezo actuating devices may be installed closer together to improve the microactuator stroke performance in moving the slider over the disk surface.. ... Hgst Inc

12/03/15 / #20150348574

Extended spin torque oscillator

The present disclosure generally relates to a high-frequency oscillator for use in a recording device having a microwave-assisted magnetic recording head. The microwave-assisted magnetic recording head achieves a large assist effect by using an extended spin torque oscillator disposed between a main magnetic pole and a pole opposite the main magnetic pole. ... Hgst Inc

12/03/15 / #20150347012

System and method of interleaving data retrieved from first and second buffers

A host interface communicates with a non-volatile memory (nvm) device over a bus. The host interface includes a first buffer, a second buffer and a scatter/gather list (sgl). ... Hgst Inc

11/19/15 / #20150332728

Hard disk drive base having vibration propagation mitigation feature

A hard disk drive (hdd) enclosure base is described, in which a mechanical feature is implemented that mitigates the propagation of vibration through the base. For example, an hdd base as described can mitigate the propagation of vibration to the head suspension and thereby eliminate read-back signal losses resulting from such vibration, such as in response to an op-shock event.. ... Hgst Inc

11/19/15 / #20150332711

Asymmetric mamr head with self-aligned spin torque oscillator along flare edge for shingled magnetic recording

The present disclosure generally relates to the structure of a perpendicular magnetic write head for use in a magnetic disk drive. A shingled-microwave-assisted magnetic recording head for use in a high-areal-density hard disk drive comprises a trailing shield, a flare-shaped main pole, one or more side shields, a spin torque oscillator, and two asymmetric side gaps, where one side gap has a smaller width than the other side gap. ... Hgst Inc

11/19/15 / #20150331794

Systems and methods for cache coherence protocol

The present disclosure relates to systems, methods, and computer program products for keeping multiple caches updated, or coherent, on multiple servers when the multiple caches contain independent copies of cached data. Example methods may include receiving a request to write data to a block of a first cache associated with a first server in a clustered server environment. ... Hgst Inc

11/12/15 / #20150325264

Method using epitaxial transfer to integrate hamr photonic integrated circuit (pic) into recording head wafer

Embodiments of the present invention generally relate to a method for forming a hamr device having a photonic integrated circuit that includes an optical detector, an optical emitter, and an optical element distinct from the optical detector and the optical emitter, where the elements of the photonic integrated circuit are aligned with a near field transducer. The method includes forming one or more layers on a substrate, bonding the layers to a partially fabricated recording head, removing the substrate using epitaxial lift-off, and forming the optical elements on the partially fabricated recording head.. ... Hgst Inc

11/12/15 / #20150325258

Stiff discrete insert array for thermal ptr management with desired induced stress state that reduces tendency for write pole erasure

Embodiments of the present invention generally relate to a magnetic device having a discontinuous array of columns disposed near a magnetic pole. Each column has a length extending perpendicular to an air bearing surface and a width. ... Hgst Inc

11/12/15 / #20150324387

Broadcast data operations in distributed file systems

Systems, methods, and software for distributed file systems (dfs) are provided herein. In one example, the dfs is operable to respond to a write operation for the dfs by transferring a write command to a selected storage system for broadcast of the write command to a plurality of storage devices associated with a network switch fabric of the selected storage system. ... Hgst Inc

11/12/15 / #20150324134

System and method for caching solid state device read request results

Techniques for caching results of a read request to a solid state device are disclosed. In some embodiments, the techniques may be realized as a method for caching solid state device read request results comprising receiving, at a solid state device, a data request from a host device communicatively coupled to the solid state device, and retrieving, using a controller of the solid state device, a compressed data chunk from the solid state device in response to the data request. ... Hgst Inc

11/12/15 / #20150324118

System and method for peer-to-peer pcie storage transfers

Techniques for peer-to-peer peripheral component interconnect express (pcie) storage transfers are disclosed. In some embodiments, the techniques may be realized as a method for providing peer-to-peer storage transfers between pcie devices including providing, in memory of a first pcie device, a queue for data communicated between the first pcie device and a target pcie device, receiving, at the first pcie device, queue memory allocation information transmitted from a host device communicatively coupled to the first pcie device and the target pcie device, and generating, using a computer processor of the first pcie device, a storage command.. ... Hgst Inc

11/05/15 / #20150318005

Waveguide power sensor structures free of optical coherence effects in a hamr drive

Embodiments disclosed herein generally relate to a hamr device for use in a magnetic reading system. The hamr device has a primary waveguide extending from a media facing surface to a surface opposite the media facing surface. ... Hgst Inc

11/05/15 / #20150317247

Optimized garbage collection algorithm to improve solid state drive reliability

A method for managing memory operations in a storage device having a plurality of data blocks, the method including steps for determining a number of page reads for each of the plurality of data blocks and determining a dwell time for each of the plurality of data blocks. In certain aspects, the method further includes steps for associating the plurality of data blocks with a plurality of rank groups based on the number of page reads and the dwell time associated with each of the plurality of data blocks and selecting a data block, from among the plurality of data blocks, for memory reclamation based on the associated rank group and the selected data block. ... Hgst Inc

11/05/15 / #20150316964

Segmented frame for a storage drive

A segmented frame adapted to receive a storage drive is provided. The segmented frame in one example includes a plurality of linked frame segments configured to pivot with respect to each other and wrap around the storage drive, with a first frame segment and a last frame segment of the plurality of linked frame segments latching together to form a joined segmented frame and hold the storage drive, and a plurality of isolator cups trapped within the joined segmented frame and fitting over a corresponding plurality of mounting wings extending from the storage drive, wherein the plurality of isolator cups suspend the storage drive within the joined frame.. ... Hgst Inc

11/05/15 / #20150315515

Uv cross-linking neat lubricant mixtures for magnetic recording media

Disclosed herein is a lubricant for lubricating a surface of a magnetic recording medium. The lubricant is a substantially solvent free lubricant that includes a plurality of lubricant molecules. ... Hgst Inc

10/29/15 / #20150313028

Isolator system for a segmented frame for a storage drive

An isolator system for a segmented frame is provided. The isolator system in one example includes a riser block configured to be affixed in a riser aperture of the segmented frame, with the riser block including one or more damper receptacles and one or more corresponding central shafts extending up at least partially through the one or more damper receptacles, one or more elastomeric dampers comprising substantially cylindrical bodies and central bores extending partially through the bodies, with the one or more elastomeric dampers fitting over the one or more shafts and into the damper receptacles, with the one or more elastomeric dampers being formed of an at least partially elastomeric material, and one or more coil springs located over the one or more elastomeric dampers, wherein the one or more elastomeric dampers and the one or more coil springs compress in response to force.. ... Hgst Inc

10/29/15 / #20150310921

Programming algorithm for improved flash memory endurance and retention

A method applies a first set of consecutive pulses to flash memory cells in one or more flash memory devices to program the flash memory cells using a first pulse increment, a voltage of each consecutive pulse of the first set being incremented by the first pulse increment. On receiving an indication that the flash memory cells are partially programmed after the first set of consecutive pulses is applied, the first pulse increment is adjusted to an adjusted pulse increment based on a number of program/erase cycles associated with the flash memory cells. ... Hgst Inc

10/29/15 / #20150310884

Soft underlayer having a multilayer structure for high areal density perpendicular recording media

According to one embodiment, a soft underlayer structure includes a coupling layer, at least one outer soft underlayer positioned above and below the coupling layer, and at least one inner soft underlayer positioned above and below the coupling layer between the coupling layer and the associated outer soft underlayer, where the inner soft underlayers have a saturation magnetic flux density and/or a thickness that is different than a saturation magnetic flux density and/or a thickness of the outer soft underlayers.. . ... Hgst Inc

10/29/15 / #20150306812

Nanoimprinting master template

A nanoimprinting master template is an ultraviolet-transparent substrate, like fused quartz, with a metallic layer having silicon dioxide pillars extending from the metallic layer and an optional silicon dioxide film on the pillars and on regions of the metallic layer between the pillars. The pillars have a generally rectangular shape and are arranged as a pattern of radial spokes and concentric rings.. ... Hgst Inc

10/22/15 / #20150304421

Metadata based data alignment in data storage systems

To provide enhanced operation of data storage devices and systems, various systems, methods, and firmware are provided herein. In a first example, a data storage device is presented. ... Hgst Inc

10/22/15 / #20150302930

Flash storage device with data integrity protection

A flash storage device includes a power hold circuit including a double layer capacitor. A power source supplies power to the flash storage device and charges the double layer capacitor. ... Hgst Inc

10/22/15 / #20150302878

Patterned perpendicular magnetic recording medium with ultrathin noble metal interlayer

A bit-patterned media (bpm) magnetic recording disk has a cobalt (co) alloy recording layer (rl), a ruthenium (ru) containing underlayer (ul), and a noble metal film (nmf) as an interlayer between the rl and the ul. The rl is preferably oxide-free and is a co alloy, like a coptcr alloy, with a hexagonal-close-packed (hcp) crystalline structure with its c-axis oriented substantially perpendicular to the plane of the rl. ... Hgst Inc

10/22/15 / #20150302877

Plasma polish for magnetic recording media

Embodiments described herein provide improvements in magnetic recording media by utilizing xenon plasma to polish a cap layer prior to depositing a carbon overcoat onto the cap layer. One embodiment comprises a method of operating a carbon overcoat deposition station. ... Hgst Inc

10/22/15 / #20150302873

Two side by side mimo read sensors fabricated by self-aligned processing

The present invention generally relates to a read head in a magnetic recording head. The read head has side-by-side sensors that are formed of the same width by initially forming a single sensor and then removing selected portions of either the pinned or free magnetic layer of the sensor. ... Hgst Inc

10/22/15 / #20150301930

File storage via physical block addresses

Examples disclosed herein provide systems, methods, and software for storing objects, such as files, via physical block addresses and media characteristics. In one example, a method for operating a processing system on a storage device includes identifying media characteristics for a storage media. ... Hgst Inc

10/01/15 / #20150279416

Magnetization control for magnetic shield in magnetic recording head

A hard disk drive (hdd) is described which includes a magnetic field-generating device in the vicinity of a load/unload ramp such that the write head moves into a magnetic field generated by the device while the head is being unloaded from disk, whereby the magnetic field pins in a predominant direction the direction of magnetization of a magnetic shield associated with the write head, and away from the direction toward the disk. Recording magnetic field leakage associated with the shield is thereby suppressed and corresponding far track interference is inhibited.. ... Hgst Inc

10/01/15 / #20150279392

Higher stability read head utilizing a partial milling process

In one embodiment, a method for forming a magnetoresistive read head includes forming a fixed layer having a first ferromagnetic material that has a fixed direction of magnetization above a lower shield layer, forming a free layer having a second ferromagnetic material positioned above the fixed layer, the free layer having a non-fixed direction of magnetization, forming a first mask above the free layer, the first mask having a predetermined width based on a track width of a magnetic medium, etching the free layer down to the fixed layer using the first mask as a guide, wherein substantially none of the fixed layer is etched, and wherein the fixed layer extends beyond both sides of the free layer in a cross-track direction, and forming magnetic domain control films on both sides of the free layer in the cross-track direction, the magnetic domain control films including a soft magnetic material.. . ... Hgst Inc

09/24/15 / #20150268702

Shaped backplane for receiving electrical components

A backplane configured to receive electrical components is provided. The backplane in one example includes a substantially planar substrate comprising an at least partially flexible material and formed in a non-rectangular shape, a series of alternating connector islands formed along two substantially parallel axes, wherein each connector island is able to move independently of other connector islands, a plurality of backplane traces extending from the series of alternating connector islands to a backplane connector region of the substrate, with a number of backplane traces increasing closer to the backplane connector region, and one or more spring elements bridging between a particular connector island and the substrate, with the one or more spring elements allowing the particular connector island to flex with respect to the substrate and absorb vibrations.. ... Hgst Inc

09/24/15 / #20150268701

Backplane for receiving electrical components

A backplane configured to receive electrical components is provided. The backplane in one example includes a substrate comprising an at least partially flexible material, a plurality of backplane traces formed as part of the substrate, at least one connector island formed in the substrate, with the at least one connector island located in an opening in the substrate and configured to receive at least one mating electrical component, and one or more spring elements bridging between the at least one connector island and the substrate, with traces of the plurality of backplane traces extending over the one or more spring elements to the at least one connector island and with the one or more spring elements allowing the at least one connector island to flex with respect to the substrate and absorb vibrations.. ... Hgst Inc

09/17/15 / #20150262660

Asymmetric log-likelihood ratio for flash channel

Disclosed is a system and method for reading flash memory cells with dynamically adjusted probability values (e.g., log-likelihood ratios). In connection with reading bit values from flash memory cells, one or more predetermined first probability values are adjusted relative to one or more predetermined second probability values. ... Hgst Inc

09/17/15 / #20150262603

Perpendicular magnetic recording medium with grain isolation layer

A perpendicular magnetic recording medium with an grain isolation layer is disclosed. In one embodiment, a perpendicular magnetic recording medium comprising a substrate, a soft magnetic under layer formed over the substrate, a seed layer comprising an upper layer and a lower layer formed over the soft magnetic underlayer, an intermediate layer formed of ru or an ru alloy formed over the seed layer and a recording layer formed over the intermediate layer, forming a grain isolation layer on the upper layer of the seed layer is provided.. ... Hgst Inc

09/10/15 / #20150257293

Feedthrough connector for hermetically sealed electronic devices

The present disclosure relates to an apparatus that includes an electrical connector that is coupled to a housing and that extends through a feedthrough aperture in the housing. The electrical connector has an electrically insulating base that has multiple layers of electrically insulating material with electrical traces extending between the multiple layers. ... Hgst Inc

09/10/15 / #20150254674

Return merchandise authorization for digital storage devices

Disclosed herein is a return merchandise authorization apparatus for a digital storage device that includes a diagnostic module that diagnoses a condition of the digital storage device. The apparatus also includes a certificate authorization module that authorizes use of a return merchandise authorization certificate based at least partially on the condition of the digital storage device. ... Hgst Inc

09/10/15 / #20150254135

Error correction with on-demand parity sectors in magnetic data storage devices

Data storage devices are described with an ecc system that generate additional on-demand ecc information for a previously written track to provide for correction of data errors in the track and thereby avoid having to rewrite the track. Embodiments of the invention address the squeeze-error problem that arises when writing the next (second) track in a sequence causes errors to be introduced in the adjacent previously written (first) track. ... Hgst Inc

09/03/15 / #20150248935

Apparatus, systems, and methods for operating flash backed dram module

A device includes volatile memory; one or more non-volatile memory chips, each of which is for storing data moved from the volatile-memory; an interface for connecting to a backup power source arranged to temporarily power the volatile memory upon a loss of power from a primary power source; a controller in communication with the volatile memory and the non-volatile memory, wherein: the controller is programmed to move data from the volatile memory to the non-volatile memory chips upon a loss of power of the primary power source of the volatile memory; and the at least one parameter describing the volatile memory are stored in at least one of the non-volatile memory chips that store the data moved from the volatile memory. In some aspects the at least one parameter includes serial presence detect information.. ... Hgst Inc

09/03/15 / #20150248909

Structure with seed layer for controlling grain growth and crystallographic orientation

According to one embodiment, a structure includes a substrate; an epitaxial seed layer positioned above the substrate, the epitaxial seed layer including a plurality of nucleation regions and a plurality of non-nucleation regions; and a crystalline layer positioned above the epitaxial seed layer, where the epitaxial seed layer has a crystallographic orientation substantially along an axis perpendicular to an upper surface of the substrate.. . ... Hgst Inc

09/03/15 / #20150248907

Recessed irmn reader sensor design with high hk applied to both reference and pin layers

The embodiments disclosed generally relate to a magnetic read head having a recessed antiferromagnetic layer and a recessed pinned magnetic layer. The recessed pinned magnetic layer is only partially recessed from the mfs, but the recess amount is the same amount as the antiferromagnetic layer. ... Hgst Inc

09/03/15 / #20150248904

Side shield reader with a shield exciting coil

In one embodiment, an apparatus includes at least one read head, each read head including a magnetoresistive (mr) read element, having a lower shield layer, an underlayer positioned above the lower shield layer, an antiferromagnetic (afm) layer positioned above the underlayer, a magnetization pinned layer positioned above the afm layer, an insulating layer positioned above the magnetization pinned layer, and a magnetization free layer positioned above the insulating layer, magnetic side shields positioned on both sides of the mr read element in a cross-track direction, and at least one shield excitation coil configured to excite magnetization of the side shields. In another embodiment, a method for forming a read sensor includes forming a mr read element, forming magnetic side shields on both sides of the mr read element in a cross-track direction, and forming at least one shield excitation coil configured to excite magnetization of the side shields.. ... Hgst Inc

09/03/15 / #20150248903

Af-coupled dual side shield reader with af-coupled usl

The embodiments disclosed generally relate to a read head sensor in a magnetic recording head. The read head sensor comprises side shields in addition to the upper and lower shields. ... Hgst Inc

09/03/15 / #20150248900

Multi-track reader for improved signal to noise ratio

A system according to one embodiment includes a magnetic head having a plurality of sensors arranged to simultaneously read at least three immediately adjacent data tracks on a magnetic medium, wherein none of the sensors share more than one lead with any other of the sensors. Such embodiment may be implemented in a magnetic data storage system such as a disk drive system, which may include a magnetic head, a drive mechanism for passing a magnetic medium (e.g., hard disk) over the magnetic head, and a controller electrically coupled to the magnetic head.. ... Hgst Inc

08/27/15 / #20150243514

Method for directed self-assembly (dsa) of a block copolymer (bcp) using a blend of a bcp with functional homopolymers

A method for directed self-assembly (dsa) of block copolymers (bcps) uses a bcp blend with a small portion of functional homopolymers, called “inks”, before deposition and annealing of the bcp. A substrate has a patterned sublayer formed on it. ... Hgst Inc

08/27/15 / #20150243319

Hard disk drive disk separator plate construction

Improving track following performance and reliability in a hard disk drive involves the use of disk separator plates positioned between adjacent recording disks, where a disk separator plate is made of stamped metal with plastic over-molded mounting portions coupled to the metal, thereby reducing the reliability risks associated with the use of fiber-filled materials.. . ... Hgst Inc

08/27/15 / #20150239184

Solvent annealing of block copolymer films under super-saturated atmospheres

In one embodiment, a system for solvent annealing of a block copolymer film includes a solvent annealing chamber, and a controller configured to control at least one processing parameter for inducing a super-saturation of a solvent in an atmosphere within the solvent annealing chamber. In another embodiment, a method for solvent annealing of a block copolymer film includes inducing a super-saturation of a solvent in an atmosphere within a solvent annealing chamber having a block copolymer film therein for inducing formation of polymeric domains.. ... Hgst Inc

08/20/15 / #20150235892

Wafer clamp for controlling wafer bowing and film stress

A wafer clamp according to one embodiment includes an outer ring, and at least three members extending inwardly from the outer ring, each of the members having a contact area for engaging a wafer. A system includes a structure having at least one ring, each ring being for receiving a wafer, and a wafer clamp configured to clamp a wafer to each ring, the wafer clamp having an outer ring, and at least three members extending inwardly from the outer ring, each of the members having a contact area for engaging a wafer.. ... Hgst Inc

08/20/15 / #20150235664

Ultra-low profile multidentate lubricant for use as a sub-nanometer thick lubricant layer for magnetic media

According to one embodiment, a lubricant includes a multidentate perfluoropolyether having a chemical structure of: re—rz—ri—rz—ri—rz—re, where rz includes at least one perfluoroethyl ether unit, and where re and ri each include at least one functional group configured to attach to a surface.. . ... Hgst Inc

08/20/15 / #20150235663

Compensation of laser diode introduced flying height changes

Embodiments described herein generally relate to controlling the flying height of a slider. The methods can include transmitting radiation from a radiation source, determining a change in temperature, the change in temperature being the difference between a first temperature and an ambient temperature and changing the flying height of the slider and head based on the change in temperature. ... Hgst Inc

08/13/15 / #20150228297

Magnetic sensor having optimal free layer back edge shape and extended pinned layer

A magnetic read sensor having an extended pinned layer and having a free layer structure with a back edge formed at an angle for optimizing sensor performance and pinned layer pinning. The magnetic free layer has a back edge that is formed at an angle of between 6 and 10 degrees relative to a plane parallel with the air bearing surface plane. ... Hgst Inc

08/13/15 / #20150228295

Af-mode sto with negative hk spin polarization layer

The embodiments disclosed generally relate to an sto structure for a magnetic head. The sto structure has an fgl having a greater thickness than the spl. ... Hgst Inc

08/13/15 / #20150225850

Method for line density multiplication using block copolymers and sequential infiltration synthesis

Block copolymers (bcps) and synthetic infiltration synthesis (sis) are used to double the line density on a substrate. The bcp comprises first and second interconnected bcp components with a functional group at the junction or interface of the components. ... Hgst Inc

08/06/15 / #20150221330

Perpendicular magnetic recording disk with template layer formed of a blend of nanoparticles

A continuous-media perpendicular magnetic recording disk has a granular recording layer (rl) with controlled grain pitch distribution and controlled long range ordering of the grains. The disk includes a substrate with a template layer for the rl that comprises a blend of at least two different sized nanoparticles. ... Hgst Inc

08/06/15 / #20150221329

Zig-zag mimo head reducing space between three sensors

The embodiments disclosed generally relate to a magnetic recording head having three magnetoresistive effect elements. The structure comprises a first magnetoresistive effect element on a lower magnetic shield layer. ... Hgst Inc

08/06/15 / #20150221328

Magnetic read sensor with bar shaped afm and pinned layer structure and soft magnetic bias aligned with free layer

A magnetic sensor having a structure that optimizes magnetic pinning strength and magnetic free layer stability. The sensor includes a sensor stack having a magnetic free layer that extends to a first stripe height and a pinned layer that extends beyond the first stripe height to a second stripe height. ... Hgst Inc

08/06/15 / #20150221325

Scissor type magnetic sensor with high magnetic moment bias structure for reduced signal asymmetry

A scissor type magnetic sensor having a magnetic bias structure extending from the back edge of first and second magnetic free layers. The magnetic bias structure is constructed of a magnetic material having a high magnetic moment, such as nife with a high fe content or cofe. ... Hgst Inc

08/06/15 / #20150221324

Near field transducer having notch diffusion barrier

An apparatus according to one embodiment includes a near field transducer comprising a conductive metal film having a main body, a notch extending from the main body, and a notch diffusion barrier layer interposed between the notch and the main body. An apparatus according to another embodiment includes a write pole, and a near field transducer adjacent the write pole. ... Hgst Inc

08/06/15 / #20150220590

Synthetic updates for file system information

To provide enhanced operation of storage control systems associated with data storage devices, such as rotating media-based hard drives, various systems and methods are provided herein. In some examples, these systems and methods can provide for receiving write requests from a host system to write content elements to storage media in a storage subsystem. ... Hgst Inc

07/30/15 / #20150214038

Method for directed self-assembly (dsa) of block copolymers

In directed self-assembly (dsa) of a block copolymer (bcp), a patterned sublayer on a substrate serves as a guiding chemical prepattern on which bcps form more uniform and/or denser patterns. A layer of a blend of a bcp and functional homopolymers, referred to as inks, is deposited on the patterned sublayer and annealed to change the initial chemical prepattern to a 1:1-like chemical pattern that is more favorable to dsa. ... Hgst Inc

07/30/15 / #20150213820

Magnetic recording head having thermal fly height control element with near zero magnetomotive force

A magnetic recording head with thermal fly height control, wherein the heating element is configured to eliminate magnetic field effects on the writing pole, which would cause otherwise cause non-symmetric writing or pole erasure. Non-symmetric writing is a phenomenon wherein magnetic writing favors one direction over another, thereby causing a timing shift in recorded data. ... Hgst Inc

07/30/15 / #20150213818

Dual stage microactuator flexure feature for minimizing electrical shorts

Approaches to a flexure gimbal assembly for a hard-disk drive (hdd), having a feature for reducing the risk of electrical shorts, include a flexure having an electrically conductive layer and an insulating layer having a flexure tongue with which one or more microactuator piezo actuating device is coupled, where the flexure tongue comprises a gap positioned to inhibit contact between the conductive adhesive and the conductive layer of the flexure which may otherwise cause an electrical short.. . ... Hgst Inc

07/30/15 / #20150213816

Dual capping layer utilized in a magnetoresistive effect sensor

The present disclosure generally relates to a read head sensor in a magnetic recording head. The read head sensor comprises a dual capping layer in a sensor stack that may reduce magnetic coupling so as to enhance magnetic bias field, e.g., domain control, in the read head sensor. ... Hgst Inc

07/30/15 / #20150213814

Partial main pole lamination for pole erasure improvement

The embodiments of the present invention relate to a magnetic write head and a method for forming the magnetic write head. The magnetic write head includes a partially laminated main pole that has a magnetic layer that is recessed from a media facing surface, a nonmagnetic spacer layer disposed on and adjacent to the magnetic layer and a laminated stack disposed on at least a portion of the nonmagnetic layer. ... Hgst Inc

07/30/15 / #20150212735

Host read command return reordering based on time estimation of flash read command completion

Managing data returns to a host in response to read commands, an operation monitor of a solid-state drive (ssd) manages counters used to hold metrics that characterize the estimated time to complete a read operation on a corresponding flash die. A timer generates a periodic event which decrements the counters over time. ... Hgst Inc

07/23/15 / #20150206550

Recessed irmn reader process

The embodiments of the present invention relate to a method for forming a magnetic read head with pinned layers extending to the abs of the read head and magnetically coupled with an antiferromagnetic layer that is recessed in relation to the abs of the read head. Portions of the antiferromagnetic layer and a magnetic layer that are extending to the abs are removed, exposing a shield. ... Hgst Inc

07/23/15 / #20150206545

Surface diffusion inhibitor for hamr nft

Embodiments of the present invention generally relate to a hamr head including a near field transducer having an antenna, a surface diffusion inhibitor layer disposed on a portion of the antenna and an aperture disposed over the surface diffusion inhibitor layer. The surface diffusion inhibitor layer has a greater melting point than the antenna, and the surface diffusion inhibitor layer material is immiscible in the antenna material.. ... Hgst Inc

07/16/15 / #20150199990

Fabrication of multiple sensor layers with self-aligned back edge

The embodiments of the present invention relate to a method for forming a magnetic read head having one or more sensors disposed over one or more sensors. The method includes forming one or more first sensors on a shield, forming a spacer layer over the one or more first sensors and forming one or more second sensors over the spacer layer. ... Hgst Inc

07/16/15 / #20150199987

System and method for nft protrusion compensation

Embodiments described herein generally relate to method of maintaining the flying height of a head during a write operation. Methods described herein disclose the application of an electrical bias to create a coulomb force between the head and the magnetic disk. ... Hgst Inc

07/16/15 / #20150199985

Fabrication of side-by-side for mimo recording

The embodiments of the present invention relate to a method for forming a magnetic read head having side by side sensors. The method includes depositing a pinned layer, a barrier layer and a free layer over a shield, and removing portions of the pinned layer, barrier layer and free layer to expose portions of the shield. ... Hgst Inc

07/16/15 / #20150199177

Random number generator by superparamagnetism

In one general embodiment, a system includes at least one magnetic nanoparticle; a heating device for heating the at least one magnetic nanoparticle to induce a paramagnetic thermal instability in the at least one magnetic nanoparticle whereby a magnetization of the magnetic nanoparticle randomly switches between different detectable magnetic states upon heating thereof; and a magnetoresistance reading device for detecting an instantaneous magnetic state of the magnetic nanoparticle.. . ... Hgst Inc

07/09/15 / #20150194468

High current capable access device for three-dimensional solid-state memory

The present invention generally relates to three-dimensional arrangement of memory cells and methods of addressing those cells. The memory cells can be arranged in a 3d orientation such that macro cells that are in the middle of the 3d arrangement can be addressed without the need for overhead wiring or by utilizing a minimal amount of overhead wiring. ... Hgst Inc

06/25/15 / #20150179204

Thermally stable au alloys as a heat diffusion and plasmonic underlayer for heat-assisted magnetic recording (hamr) media

According to one embodiment, a magnetic medium includes a plasmonic underlayer having an au alloy, where the au alloy includes one or more alloying components that are substantially immiscible in au; and a magnetic recording layer above the plasmonic underlayer. According to another embodiment, a magnetic medium, includes a multilayered plasmonic underlayer; and a magnetic recording layer above the multilayered plasmonic underlayer.. ... Hgst Inc

06/25/15 / #20150179203

Lubricants providing magnetic head wear reduction and magnetic spacing improvement

A lubricant according to one embodiment includes a cyclophosphazene according to chemical formula 1,. . ... Hgst Inc

06/25/15 / #20150179197

Hamr head spot-size converters with secondary index confinement

The present invention generally relates to a hamr head having not only a tapered core for the ssc, but additionally a secondary confinement material in the cladding surrounding the core taper. The secondary confinement material prevents diverging light from the laser diode from spreading so that the light is coupled into the core of the ssc. ... Hgst Inc

06/25/15 / #20150179195

Recessed antiferromagnetic design with antiparallel pinned stitch layers for improved pinning field

In one general embodiment, a device includes an antiferromagnetic layer; a first stitch layer exchange coupled with the antiferromagnetic layer, the first stitch layer having a magnetic orientation substantially parallel to a magnetic orientation of the antiferromagnetic layer; a second stitch layer exchange coupled with the first stitch layer and having a magnetic orientation substantially antiparallel to the magnetic orientation of the first stitch layer; a pinned layer structure exchange coupled with the second stitch layer; a free layer; and a spacer layer between the free layer and the pinned layer structure. An end of the antiferromagnetic layer facing a sensing face of the device is recessed from the sensing face.. ... Hgst Inc

06/25/15 / #20150179193

Multiple readers for high resolution and snr for high areal density application

The present invention generally relates to a read head in a magnetic recording head. The read head utilizes two reader elements that are stacked in the down track direction within the same read gap to improve resolution and snr by combining the signals from the two reader elements. ... Hgst Inc

06/25/15 / #20150179192

Stray field shielding for perpendicular magnetic recording write head

The present invention relates to stray magnetic shielding in pmr systems. The stray magnetic fields can funnel through the magnetic write head into the recording medium and lead to degradation in performance, even erasure. ... Hgst Inc

06/25/15 / #20150178017

Abort function for storage devices by using a poison bit flag wherein a command for indicating which command should be aborted

An abort function for storage devices sets a “poison bit” flag in the command to be deleted while the command resides on a submission queue prior to being fetched by the ssd controller. In response to the set “poison bit” flag, a storage device controller aborts execution of the i/o command and returns an abort successful status reply to the completion queue.. ... Hgst Inc

06/25/15 / #20150177994

Doorless protocol having multiple queue read requests in flight

The present disclosure relates to methods and systems for performing operations in a communications protocol. An example method can include submitting, from a device, a request for a queue entry representing a command from a host comprising a request for data stored at a device memory location; receiving the command from the host; and executing the command. ... Hgst Inc

06/18/15 / #20150170707

System and method for testing data storage systems utilizing micro-transitions

A method of testing a one or more components of a data storage system introduces a first plurality of micro-transitions into a first data write pattern, which is then written to a magnetic media. A read-back signal is generated, and a frequency response of the read-back signal is analyzed to determine performance of the one or more components of the data storage system.. ... Hgst Inc

06/18/15 / #20150170696

All-optical magnetic recording system using femnpt media

An “all optical switching” (aos) magnetic recording system, i.e., one that does not require a magnetic field to reverse the magnetization in the magnetic recording media, uses a femnpt l10 alloy as the magnetic media. A femnpt alloy, with appropriate amounts of mn, will have high magneto-crystalline anisotropy, but also ferrimagnetic spin alignment for triggering aos. ... Hgst Inc

06/18/15 / #20150170695

Systems and methods for clearance monitoring in storage media

A method for measuring the head-disk clearance between a slider and a disk includes measuring a first resistance with a first bias applied to an embedded contact sensor of the slider, measuring a second resistance with a second bias applied to the embedded contact sensor of the slider, and determining the head-disk clearance based at least in part on a difference between the first resistance and the second resistance. A system includes a disk drive, a slider comprising an embedded contact sensor, and circuitry to apply at least two bias voltages to the embedded contact sensor, measure at least two resistances of the embedded contact sensor based on the application of the at least two bias voltages, and to determine the head-disk clearance based at least in part on a difference between the at least two resistances.. ... Hgst Inc

06/18/15 / #20150170690

Shielded flex cable for use in a disk drive

A flex cable with a shielding layer for use in a disk drive is described. The flex cable connects the actuator to the system electronics. ... Hgst Inc

06/18/15 / #20150170687

Implementing asymmetric degauss control for write head for hard disk drives

A method, apparatus, and system for implementing enhanced asymmetric degauss control for a write head for hard disk drives. A degauss period is provided at the end of a write. ... Hgst Inc

06/18/15 / #20150170685

Noble metal surrounded magnetic lip and heat sink for heat assisted magnetic recording head

The embodiments of the present invention generally relate to a magnetic head having a magnetic lip. The vertical sides and the bottom of the magnetic lip are covered by one or more conductive layers. ... Hgst Inc

06/18/15 / #20150170683

Heat assisted magnetic recording head employing noble metal alloy as diffusion barrier layer

The present invention generally relates to a hamr head. An insulating layer isolates the nft from the magnetic lip of the magnetic pole. ... Hgst Inc

06/11/15 / #20150162029

Thermally-assisted magnetic recording head

In one embodiment, a device includes a light source, a near-field light transducer including an electroconductive scattering body configured for generating near-field light when irradiated by light from the light source, the near-field light transducer including a triangular shape at a media-facing surface thereof having three apexes including a trailing-side apex positioned on a trailing side of the near-field light transducer, a main pole configured for writing data to a magnetic medium, the main pole being positioned in a down-track direction from the near-field light transducer, a first material positioned near the trailing-side apex of the near-field light transducer, and a second material positioned near other apexes of the near-field light transducer, the first material being more difficult to etch than the second material, wherein the near-field light transducer is configured to assist the main pole in writing data to the magnetic medium by production of the near-field light.. . ... Hgst Inc

06/11/15 / #20150162024

Perpendicular magnetic recording head having a trailing side taper angle which is less than a leading side taper angle

In one embodiment, a perpendicular magnetic recording head includes a main pole configured to write data to a magnetic medium, a leading-side magnetic shield positioned on a leading side of the main pole in a down-track direction adjacent a media-facing surface of the head, and a trailing-side magnetic shield positioned on a trailing side of the main pole in the down-track direction adjacent the media-facing surface of the head, wherein a trailing side taper is provided on the trailing side of the main pole in the down-track direction, wherein a leading shield taper is provided on a main pole side of the leading-side magnetic shield, and wherein an angle of the trailing side taper relative to a line extending along an element height direction is less than or equal to an angle of the leading shield taper relative to the line extending along the element height direction.. . ... Hgst Inc

06/11/15 / #20150160882

Mixed mode hard drive with idle time & expandable i-region / e-region

A computer system includes a host and a disk drive apparatus communicatively coupled to the host. The disk drive includes at least one disk having two major surfaces divided into a plurality of regions. ... Hgst Inc

06/04/15 / #20150154994

Hard disk drive actuator assembly with interleaved voice coil motor

Approaches to a rotary actuator assembly configured for use in a hard disk drive (hdd) include a voice coil interleaved between the pivot bearing and the actuator arm, providing a longer pivot-to-head dimension which reduces the radius of curvature of the arc in which the head slider travels over the disk for accessing portions of the disk. Reducing the arc radius of curvature reduces the maximum skew angles of the read-write head in association with the disk tracks. ... Hgst Inc

06/04/15 / #20150154992

Transducer resistor shunt structure for low-cost probing

Embodiments described herein generally relate to resistive shunt design in a read sensor for providing accurate measurements from an electronic lapping guide (elg). More specifically, embodiments described herein relate to a transducer resistor shunt structure for low cost probing. ... Hgst Inc

06/04/15 / #20150154991

Scissor magnetic read sensor with novel multi-layer bias structure for uniform free layer biasing

A scissor type magnetic sensor having a back edge bias structure that has a non-uniform magnetic moment to compensate for differences in magnetic spacing between the bias structure and a first magnetic free layer as compared with the magnetic spacing between the bias structure and a second magnetic free layer. The magnetic bias structure can include a first magnetic layer and a second magnetic layer formed over the first magnetic layer, with the first magnetic layer having a higher magnetic moment than the second magnetic layer.. ... Hgst Inc

06/04/15 / #20150154990

Scissor sensor with back edge bias structure and novel dielectric layer

A scissor type magnetic sensor having an improved back edge bias structure. The back edge bias structure extends beyond the sides of the sensor stack for improved bias moment and is formed on a flat topography that provide for improved magnetic biasing. ... Hgst Inc

06/04/15 / #20150154988

Head gimbals assembly, method for manufacturing thermal-assisted magnetic recording and manufacturing equipment of thermal-assisted magnetic recording

Embodiments of the present invention generally relate to a hamr head. The hamr head includes an anti-reflecting (ar) coating on a side opposite (e.g., a flex side) of the air bearing surface (abs). ... Hgst Inc

06/04/15 / #20150154987

Magnetic head having a short yoke with a tapered coil structure

In one embodiment, a magnetic head includes a main pole configured to write data to a magnetic medium using a magnetic field, a return pole positioned above the main pole at a media-facing surface of the magnetic head, the return pole being configured to return magnetic flux from the main pole after it has exited a magnetic medium, and a coil configured to produce magnetic flux in the main pole, the coil being positioned below the return pole, wherein a film thickness of a first turn of the coil on a media-facing surface side thereof is less than a film thickness of a second turn of the coil. Other magnetic heads having a shortened magnetic circuit length and methods of production thereof are presented in additional embodiments.. ... Hgst Inc

06/04/15 / #20150154986

Controlling magnetic layer anisotropy field by oblique angle static deposition

In one general embodiment, a system includes a magnetic layer having first and second magnetic sublayers. An anisotropy of the first magnetic sublayer is oriented in a different direction than an anisotropy of the second magnetic sublayer. ... Hgst Inc

06/04/15 / #20150154127

Network interface controller emulation

Examples disclosed herein provide systems, methods, and software for network interface controller emulation. In one example, a method of operating a storage subsystem coupled with a host includes emulating, to a main processing system on the host, a network connection through an emulated network interface controller (nic) to a storage volume. ... Hgst Inc

06/04/15 / #20150154120

Acoustically secure phase change memory devices

Systems, methods, and firmware for operating data storage devices and storage processors are provided herein. In one example, a data storage device is provided. ... Hgst Inc

05/28/15 / #20150147481

Method for making a scissoring-type current-perpendicular-to-the-plane (cpp) magnetoresistive sensor with exchange-coupled soft side shields

A method for making a scissoring type current-perpendicular-to-the-plane magnetoresistive sensor with exchange-coupled soft side shields uses oblique angle ion milling to remove unwanted material from the side edges of the upper free layer. All of the layers making up the sensor stack are deposited as full films. ... Hgst Inc

05/28/15 / #20150146507

Submount-integrated photodetector for monitoring a laser for a heat-assisted magnetic recording head

In a heat-assisted magnetic recording hard disk drive, a laser module includes a submount-integrated photodetector configured to receive optical energy from a laser by way of a head slider. The submount may be formed of a semiconductor material such as a crystalline silicon material, and the photodetector may be a photodiode that is integrally formed with the submount. ... Hgst Inc

05/28/15 / #20150146366

System, method and apparatus for disk drive fluid dynamic bearing

A disk drive can include an enclosure and a media disk rotatably mounted to the enclosure via a spindle. A fluid dynamic bearing (fdb) can be mounted between the enclosure and the spindle of the media disk. ... Hgst Inc

05/21/15 / #20150143194

Reduced complexity non-binary ldpc decoding algorithm

Decoding logic is provided that is operational upon a data buffer to represent a plurality of variable nodes and a plurality of check nodes. For a respective one of the variable nodes, a vector component is selected from a confidence vector associated with the variable node. ... Hgst Inc

05/21/15 / #20150143187

Implementing enhanced performance with read before write to phase change memory

A method and apparatus are provided for implementing enhanced performance with read before write to phase-change-memory. Each write to pcm is preceded by a read and a calculation to discover a location of any bad bits. ... Hgst Inc

05/21/15 / #20150138939

Dual segregant heat assisted magnetic recording (hamr) media

In one embodiment, a magnetic media suitable for hamr recording includes a recording layer having first and second magnetic layers. The first magnetic layer has a first segregant between magnetic grains thereof, the first segregant being primarily c. ... Hgst Inc

05/21/15 / #20150138937

Self-controlled laser pulsing for thermally assisted recording

A method of storing data includes providing a write signal for a write head of a hard disk drive, generating a transition pulse signal derived from the write signal using a transition pulse generator, and generating a logic signal to drive a thermal source associated with the write head of the hard disk drive. The logic signal includes the logical summation of a cyclical base pulse signal and the transition pulse signal.. ... Hgst Inc

05/21/15 / #20150138674

Single-piece yoke damper for voice coil actuator

Approaches to improving actuator settle time by damping vibrations resulting from coil modes, such as with a voice coil actuator in a hard disk drive, include a single-piece damper plate coupled to the voice coil actuator yoke. The damper plate may be a single u-shaped piece of metal that covers the area of the yoke that experiences the maximum strain energy during operation, between the voice coil and the pivot bearing housing.. ... Hgst Inc

05/21/15 / #20150138673

Method for manufacturing a magnetic tape head using an ink mask formed by printing

A method for forming a protective overcoat onto a tape bearing surface of a tape head used for magnetic tape recording. In order to ensure optimal surface tension and liftoff properties of the ink mask, the tape bearing surface is treated with a first application of ethanol, followed by an application of polydimethylsiloxane, followed by a second application of ethanol. ... Hgst Inc

05/21/15 / #20150138668

Multi-read sensor having a narrow read gap structure

In one embodiment, a magnetic head includes at least one magnetoresistive (mr) element positioned at a media-facing surface of the magnetic head, a lower portion of the at least one mr element extending in an element height direction away from the media-facing surface of the magnetic head farther than an upper portion of the at least one mr element, at least one back wiring layer positioned behind the upper portion of the at least one mr element in the element height direction and above the lower portion of the at least one mr element, the at least one back wiring layer being configured to electrically communicate with the at least one mr element, and an upper wiring layer positioned above the at least one mr element at the media-facing surface of the magnetic head and extending in the element height direction away from the media-facing surface of the magnetic head.. . ... Hgst Inc

05/21/15 / #20150138666

Method and structure for improving performance and storage density in a data storage device

A data storage device with improved data storage densities, coupled with lower hard error and write-inhibit events is described. A feed-forward write inhibit (ffwi) method enables data tracks to be written more densely. ... Hgst Inc

05/21/15 / #20150138663

Magnetic recording disk drive with write driver to write head transmission line with multiple segments having different numbers of conductive traces

A multiple-segment transmission line in a hard disk drive enables a wider optimization range of the slope, duration and amplitude of the transmission line overshoot (tlo) wave shape. There is a first segment with two traces for connection to the write driver circuitry, an end segment with two traces for connection to the write head and at least two intermediate segments. ... Hgst Inc

05/21/15 / #20150136730

Vapor phase chemical mechanical polishing of magnetic recording disks

A method for polishing a carbon overcoat of a magnetic media that results in a smooth surface free of carbon cluster debris. The method involves forming a magnetic disk having a carbon overcoat formed thereon. ... Hgst Inc

05/07/15 / #20150128008

Track-band squeezed-sector error correction in magnetic data storage devices

Data storage devices using a two-level ecc scheme are described. Embodiments of the invention allow the recovery of sectors in a squeezed group of tracks in a that includes both a single track level ecc scheme and a track band ecc scheme that functions across the set of tracks in the band. ... Hgst Inc

05/07/15 / #20150124353

Magnetic head for microwave assisted magnetic recording

Embodiments of the present invention generally relate to a mamr head. The mamr head includes an sto and an embedded contact sensor (ecs). ... Hgst Inc

05/07/15 / #20150124352

Flexible cable assembly having reduced-tolerance electrical connection pads

A flexible printed circuit (fpc) may have reduced-tolerance electrical connection pads that comprise a connection portion and an adjacent window portion, where the position of a component that is mechanically and electrically connected to the fpc is limited by the geometry of the connection portion of the respective connection pads. The window portion includes an area void of conductive material and bounded by the connection portion on one side and may be bounded by peripheral portions on the other sides, where the peripheral portions are significantly narrower than the connection portion. ... Hgst Inc

05/07/15 / #20150124350

Vertically and horizontally weakly coupled perpendicular small grain media

In one general embodiment, a magnetic medium includes a recording layer having at least three exchange control layers each having a magnetic moment less than 100 emu/cc, and four magnetic layers separated from one another by the exchange control layers. An uppermost of the magnetic layers is doped with oxygen. ... Hgst Inc

05/07/15 / #20150124347

Magnetic head having a spin torque oscillator (sto) with a hybrid heusler field generation layer (fgl)

In one embodiment, a magnetic head includes a main pole configured to write data to a magnetic medium, a trailing shield positioned on a trailing side of the main pole, and a sto between the main pole and the trailing shield, wherein the sto includes a laminated structure having a fgl, a spun polarization layer (spl), and a non-magnetic spacer positioned between the fgl and the spl, wherein the fgl includes a laminated structure having one or more layers of a cofe alloy and a heusler alloy alternately laminated in this order from an end of the fgl closest to the non-magnetic spacer. In another embodiment, a method is presented for forming such a magnetic head utilizing a fgl that includes a laminated structure baying layers of a cofe alloy and a heusler alloy alternately laminated in this order from an end of the fgl closest to the non-magnetic spacer.. ... Hgst Inc

05/07/15 / #20150124346

Cross-track interference testing of a hard disk drive

Described herein is a method for testing an electronic information storage device having a read and write head includes writing a plurality of pattern periods along a single track of a magnetic recording medium of the electronic information storage device using the write head. The method also includes mapping read head signals for each pattern period across the single track and surrounding regions of the magnetic recording medium. ... Hgst Inc

05/07/15 / #20150122772

Method and apparatus for magnetic recording head having a waveguide

A method of forming a wave guide for a heat assisted magnetic recording slider of a disk drive includes depositing a layer of waveguide material onto a substrate, and depositing a layer of a hard mask material onto the waveguide material. The method then includes depositing a layer of photoresist onto the hard mask material, and exposing the photoresist to produce a hard mask pattern that includes a waveguide pattern. ... Hgst Inc

05/07/15 / #20150121685

Coupled spot-size-converter arrays for wafer-level optical metrology

Embodiments of the present invention generally relate to an optical metrology system and methods of using the optical metrology system. The optical metrology system has a linear optical array including a plurality of optical components. ... Hgst Inc

04/30/15 / #20150118851

Method for directed self-assembly (dsa) of block copolymers

In directed self-assembly (dsa) of a block copolymer (bcp), a patterned sublayer on a substrate serves as a guiding chemical prepattern on which bcps form more uniform and/or denser patterns. A layer of a blend of a bcp and functional homopolymers, referred to as inks, is deposited on the patterned sublayer and annealed to change the initial chemical prepattern to a 1:1-like chemical pattern that is more favorable to dsa. ... Hgst Inc

04/30/15 / #20150118520

Low resistance magnetic sensor with extended pinned layer structure

A magnetic read sensor having improved pinning and reduced area resistance. The sensor has pinned magnetic layer that extends beyond the functional stripe of the sensor to improve magnetic pinning. ... Hgst Inc

04/30/15 / #20150117173

Modified areal densities for degraded storage device read heads

Systems, methods, and firmware for operating data storage devices and storage processors are provided herein. In one example, a data storage device is provided. ... Hgst Inc

04/30/15 / #20150116869

Asymmetric sensitivity reader

Embodiments described herein generally relate to a magnetic read head wherein read sensitivity distribution is made asymmetric in the off-track direction. The method of making the magnetic head is also disclosed. ... Hgst Inc

04/30/15 / #20150116867

Current-perpendicular-to-the-plane (cpp) magnetoresistive (mr) sensor having an antiparallel free (apf) structure with improved magnetic stability

A current-perpendicular-to-the-plane magnetoresistive sensor has an antiparallel free (apf) structure and soft side shields wherein the upper free layer (fl2) of the apf structure is magnetically coupled antiparallel to the top shield and a top shield seed layer via a nonmagnetic antiparallel coupling (apc) layer. In one embodiment the antiparallel coupling is through an antiferromagnetic-coupling (afc) layer that provides a dominant antiferromagnetic indirect exchange coupling of fl2 to the top shield. ... Hgst Inc

04/30/15 / #20150116860

System and methods for combining multiple offset read-backs

Techniques for processing signals read-back from a disk of a hard disk drive are described. In one example, a hard disk drive device generates a signal associated with a first position within a width of the data track. ... Hgst Inc

04/23/15 / #20150109892

Dual thermal sensor for hamr waveguide power monitor and integration with the contact sensor

Embodiments of the present invention generally relate to a hamr device having two temperature sensors. The first temperature sensor is disposed adjacent a waveguide and is about two or more micrometers away from an air bearing surface. ... Hgst Inc

04/23/15 / #20150109700

Shingled magnetic recording system with adaptive write buffer area

Techniques for writing data to a buffer region of a magnetic disk are described. In one example, a hard disk drive comprises a magnetic disk comprising a data buffer region including a first zone and a second zone. ... Hgst Inc

04/23/15 / #20150109699

Heat sink for a spin torque oscillator (sto) in microwave assisted magnetic recording (mamr)

In accordance with one embodiment, a magnetic head includes a main pole configured to emit a recording magnetic field for affecting a magnetic medium, spin torque oscillator (sto) device in electrical communication with and positioned above the main pole in a track direction, the sto device being configured to generate a high-frequency magnetic field which is superimposed with the recording magnetic field in order to record data to the magnetic medium when current flows to the sto device, and a heat sink positioned near the sto device, the heat sink being configured to reduce a temperature of the sto device when current flows to the sto device. In another embodiment, a method includes forming a heat sink behind a sto device in an element height direction perpendicular to a media facing surface, and/or on both sides of the sto device in a cross-track direction at the media facing surface.. ... Hgst Inc

04/16/15 / #20150105006

Method to sustain minimum required aspect ratios of diamond grinding blades throughout service lifetime

Embodiments of the present invention generally relate to a blade for isolating devices within a wafer and the method of isolating. The blade has a core material, a cutting material disposed on the core material, and a plating material covering a portion of the core and cutting materials. ... Hgst Inc

04/16/15 / #20150103437

Microwave- assisted recording head with stable oscillation

A magnetic recording head for microwave-assisted magnetic recording is disclosed. In one embodiment, a magnetic recording head is for applying a magnetic field from a main pole of said magnetic recording head for recording data to a disk. ... Hgst Inc

04/16/15 / #20150103434

Microwave-assisted magnetic recording (mamr) head with an inclined and recessed main pole structure

In one embodiment, a magnetic head includes a main pole configured to emit a recording magnetic field for affecting a magnetic medium, the main pole configured to serve as a first electrode and having a front portion at an air bearing surface (abs) of the magnetic head and a rear portion extending from the front portion in an element height direction perpendicular to the abs, wherein an upper surface of the front portion of the main pole is angled with respect to a plane of deposition at a first angle of inclination of greater than 0°, and wherein at least a portion of an upper surface of the rear portion of the main pole is angled at a first angle of declination greater than 0° with respect to the plane of deposition, an upper shield positioned above the main pole, the upper shield configured to serve as a second electrode, and a microwave oscillator positioned between the main pole and the upper shield at the abs.. . ... Hgst Inc

04/16/15 / #20150103433

Hard disk drive having multiple disk stacks on a rotatable platform

A lower cost per unit of storage hard disk drive (hdd) includes multiple disk stacks fixed to a carousel, and at least one head stack assembly (hsa) for accessing portions of the magnetic-recording disk(s) of each of the multiple disk stacks after the carousel rotates to move a disk stack in a fixed position relative to the hsa.. . ... Hgst Inc

04/16/15 / #20150103431

Sto with anti-ferromagnetic coupling interlayer

Embodiments described herein generally relate to a magnetic recording device for recording/reproducing data using the magnetization state of a recording medium. More specifically, embodiments described herein provide an sto structure having an spl and an fgl with an anti-ferromagnetic coupling interlayer disposed between the spl and fgl. ... Hgst Inc

04/09/15 / #20150098178

Hard disk drive with feedthrough connector

Described herein is an apparatus that includes a housing that defines an interior cavity. The housing also includes a feedthrough aperture. ... Hgst Inc

04/09/15 / #20150098153

Giant magneto resistive sensor and method for making same

A disk drive includes a disk including a magnetizable layer of material, and a transducer. The transducer has a read element that includes a first shield layer, a pinned layer, a metallic spacer, an ap (anti-parallel) free layer, and a second shield layer. ... Hgst Inc

04/09/15 / #20150098150

Magnetic write head having spin torque oscillator that is self aligned with write pole

A magnetic write head having a write pole with a tapered trailing edge portion and having a spin torque oscillator that is formed entirely on the tapered trailing edge portion and that is self aligned with first and second sides of the write pole. The write pole and spin torque oscillator are formed by a method wherein the sides of the spin torque oscillator and write pole are defined in the same photolithographic and ion milling process, thereby allowing for the self alignment of the spin torque oscillator with the sides of the write pole.. ... Hgst Inc

04/02/15 / #20150092303

Graded side shield gap reader

Embodiments of the present invention generally include magnetoresistive heads, such as read heads, having a sensor structure and side shields disposed adjacent to the sensor structure. The distance between the side shields and the sensor structure increase in a direction from an abs in the off-track direction. ... Hgst Inc

04/02/15 / #20150092292

Mamr head with recessed sto

Embodiments of the present invention generally relate to a microwave assisted magnetic recording (mamr) head. The mamr head includes a main pole, a trailing shield, and a spin torque oscillator (sto) disposed between the main pole and the trailing shield. ... Hgst Inc

03/26/15 / #20150085401

Recording medium having recording assist

An hdd includes a magnetic head, and a magnetic recording medium. The recording medium includes a recording magnetic layer, and a recording assist magnetic layer, the recording assist magnetic layer generates a high-frequency magnetic field by means of a recording field from the magnetic head, and a recording assist action acts on the recording magnetic layer.. ... Hgst Inc

03/26/15 / #20150085395

Magnetic head having a long throat height pinned layer with a short height hard bias layer

In one embodiment, a magnetic head includes a lower shield, a magnetoresistive (mr) film positioned above the lower shield, the mr film including a pinned layer, an intermediate layer positioned above the pinned layer, and a free layer positioned above the intermediate layer, the free layer being configured for sensing data on a magnetic medium, wherein a track width of the mr film is defined by a width of the free layer in a cross-track direction, a bias layer positioned on both sides of the mr film in the cross-track direction, a track insulating film positioned on both sides of the mr film in the cross-track direction and between the mr film and the bias layer, and an upper shield positioned above the bias layer and the mr film, wherein a length of the free layer in an element height direction perpendicular to an air bearing surface of the magnetic head is less than a length of the pinned layer in the element height direction.. . ... Hgst Inc

03/19/15 / #20150082084

Enhanced data recovery from data storage devices

Systems, methods, and firmware for recovery of data from storage devices are provided herein. In one example, a data storage device is provided. ... Hgst Inc

03/19/15 / #20150081956

Doorbell-less protocol for solid state drive interface

The present disclosure relates to methods and systems for performing operations in a communications protocol. An example method can include submitting, from a device, a request for a queue entry representing a command from a host comprising a request for data stored at a device memory location; receiving the command from the host; and executing the command. ... Hgst Inc

03/19/15 / #20150081955

Acknowledgement-less protocol for solid state drive interface

The present disclosure relates to methods and systems for performing operations in a communications protocol. An example method can include submitting, from a device, a request for a queue entry representing a command from a host comprising a request for data stored at a device memory location; receiving the command from the host; and executing the command. ... Hgst Inc

03/19/15 / #20150078074

Three-dimensional magnetic memory with multi-layer data storage layers

Magnetic memories and methods are disclosed. A magnetic memory as described herein includes a plurality of stacked data storage layers to form a three-dimensional magnetic memory. ... Hgst Inc

03/19/15 / #20150077879

Disk drive with preamplifier for multiple readers in a slider with a common return signal

Disk drive embodiments with common lead connections in the slider, suspension, and preamplifier are described. The arm electronics ic includes a preamplifier with single-ended input from the set of signal traces that include a common signal return lead for the plurality of read transducers (readers) in the slider. ... Hgst Inc

03/19/15 / #20150077876

Disk drive with different data sector integrated preambles in adjacent data tracks

A hard disk drive has disks with data sector preambles that allow for inter-track interference. The same data sector preamble is used for all data sectors in a track but the preamble in each track is different from the preamble in radially adjacent tracks. ... Hgst Inc

03/19/15 / #20150077875

Disk drive with different synchronization fields and synchronization marks in the data sector preambles in adjacent data tracks

A hard disk drive has disks with data sector preambles that allow for inter-track interference. The same data sector preamble is used for all data sectors in a track but the preamble in each track is different from the preamble in radially adjacent tracks. ... Hgst Inc

03/05/15 / #20150062759

Capping materials for magnetic read head sensor

Embodiments of the present invention generally relate to a magnetic head having a sensor structure comprising a pinned layer, a spacer layer, a free layer and a capping structure. The free layer has a topmost layer comprising cob and the capping structure comprises an x layer, where x is an element such as hf, zr, ti, v, nb, or ta.. ... Hgst Inc

03/05/15 / #20150062753

Stiff discrete insert array for thermal ptr management with desired induced stress state that reduces tendency for write pole erasure

Embodiments of the present invention generally relate to a magnetic device having a discontinuous array of columns disposed near a magnetic pole. Each column has a length extending perpendicular to an air bearing surface and a width. ... Hgst Inc

03/05/15 / #20150062752

Magnetic sensor with recessed afm shape enhanced pinning and soft magnetic bias

A magnetic read sensor having an antiferromagnetic located embedded within a magnetic shield of the sensor so that the antiferromagnetic layer can pin the magnetization of the pinned layer without contributing to read gap thickness. The sensor is configured with a pinned layer having a free layer structure located within an active area of the sensor and a pinned layer that extends beyond the free layer and active area of the sensor. ... Hgst Inc

03/05/15 / #20150062751

Magnetic sensor having an extended pinned layer with stitched antiferromagnetic pinning layer

A magnetic sensor having a novel pinning structure resulting in a greatly reduced gap spacing. The sensor has a magnetic free layer structure that extends to a first stripe height and a magnetic pinned layer structure that extends to a second stripe height that is longer than the first stripe high. ... Hgst Inc

03/05/15 / #20150062745

Granular media with a high-hk assist layer for microwave-assisted magnetic recording

In one embodiment, a magnetic storage device includes at least one microwave assisted magnetic recording (mamr) head, each mamr head including a spin torque oscillator (sto), a magnetic recording medium, a drive mechanism for passing the magnetic medium over the at least one mamr head, and a controller electrically coupled to the at least one mamr head for controlling operation of the at least one mamr head, wherein the magnetic recording medium includes a recording layer positioned directly or indirectly above a substrate and an assist layer positioned above the recording layer, wherein the recording layer includes at least co, pt, and an oxide or oxygen, wherein the assist layer is positioned closer to the at least one mamr head and includes at least co and pt, and wherein at least a portion of the recording layer has a smaller anisotropic magnetic field than the assist layer.. . ... Hgst Inc

02/26/15 / #20150056473

Shield with uniform magnetic properties for a perpendicular magnetic recording head

Depositing a seed layer for a high-moment shield onto a write pole may have a deleterious effect on the magnetic response of the write pole. Instead, an amorphous separation layer may be deposited between the write pole and the seed layer. ... Hgst Inc

02/12/15 / #20150044321

System, method and apparatus for manufacturing magnetic recording media

A system, method and apparatus for manufacturing high density magnetic media is disclosed. A flexible mold having a very low modulus of less than about 4 gpa is made on a rigid support. ... Hgst Inc

02/05/15 / #20150039824

Implementing enhanced buffer management for data storage devices

A method, apparatus and a data storage device for implementing enhanced buffer management for storage devices. An amount of emergency power for the storage device is used to determine a time period for the storage device between emergency power loss and actual shut down of electronics. ... Hgst Inc

02/05/15 / #20150039806

System and method for controlling a storage device

A method of controlling a storage device includes detecting a cumulative usage condition associated with the storage device, comparing the cumulative usage condition to a usage value, and adjusting the operation of the storage device based on the comparison. Another method of controlling a storage device includes detecting an operating condition associated with the storage device, comparing the operating condition to a warranty condition, and limiting the operation of the storage device to read-only operation based on the comparison.. ... Hgst Inc

02/05/15 / #20150037614

Composition and method for planarized bit-patterned magnetic media

The present disclosure relates to a planarized bit-patterned magnetic medium that has a magnetic layer, including island regions and trench regions, a first carbon layer applied over the magnetic layer, and a second carbon layer applied over the first carbon layer, wherein the second carbon layer has been removed in the island regions. The first carbon layer may have a lower material removal rate when exposed to chemical-mechanical polishing than the second carbon layer. ... Hgst Inc

02/05/15 / #20150036470

E-antenna near field transducer with thermal shunt to return pole

In a heat-assisted magnetic recording head for use in a hard disk drive, a thermal shunt is positioned between an e-antenna near field transducer (nft) and a return pole, to draw excess heat away from the nft region. The thermal shunt comprises two portions separated by a gap that has a trapezoidal cross-section, where the nft-side of the gap is wider than the return pole-side of the gap.. ... Hgst Inc

02/05/15 / #20150036468

Method using epitaxial transfer to integrate hamr photonic integrated circuit (pic) into recording head wafer

Embodiments of the present invention generally relate to a method for forming a hamr device having a photonic integrated circuit that includes an optical detector, an optical emitter, and an optical element distinct from the optical detector and the optical emitter, where the elements of the photonic integrated circuit are aligned with a near field transducer. The method includes forming one or more layers on a substrate, bonding the layers to a partially fabricated recording head, removing the substrate using epitaxial lift-off, and forming the optical elements on the partially fabricated recording head.. ... Hgst Inc

02/05/15 / #20150036244

System and method of forming spacer structures using ultra narrow magnetic head fabrication

A magnetic head, according to one embodiment, includes a sensor structure extending from an air bearing surface end thereof in a stripe height direction, the sensor structure having sidewalls on opposite sides thereof, the sidewalls extending between a top and a bottom of the sensor structure, the sidewalls extending in the stripe height direction, wherein a spacing between the sidewalls in a track width direction along the top of the sensor structure is about constant therealong in the stripe height direction.. . ... Hgst Inc

02/05/15 / #20150036235

Write current and fly height adjustment for compensating media coercivity variation

A data storage device with compensation for coercivity variations in a magnetic disk storage medium is disclosed. Two procedures are executed to perform the coercivity compensation. ... Hgst Inc

01/29/15 / #20150029615

Magnetic write head having a recessed high moment portion of the wrap-around shield

Approaches to improving hard disk drive far track interference problems include utilizing a wrap-around shield having recessed high magnetic moment layer(s). Embodiments include tapering the high-moment portion away from the air bearing surface (abs) in the cross-track direction away from the write pole, thereby reducing exposure of high moment layers at the abs to reduce the risk of unwanted track erasure away from the main pole. ... Hgst Inc

01/29/15 / #20150029611

Stitched pole having a tapered tip

In one general embodiment, a magnetic head includes a stitch pole; and a main pole formed adjacent the stitch pole, wherein an end region of the stitch pole closest to an air bearing surface of the head tapers towards the main pole. In another general embodiment, a magnetic head includes a stitch pole being a laminate of at least two magnetic layers separated b a nonmagnetic layer; and a main pole formed adjacent the stitch pole. ... Hgst Inc

01/29/15 / #20150029610

Magnetic head having a soft magnetic layer with a close-packed plane thereof being parallel or oblique to an air bearing surface

In one embodiment, a magnetic head includes a magnetoresistive sensor having a free layer and a soft magnetic layer adapted to control a magnetization direction of the free layer and a magnetic domain of the free layer, wherein a close-packed plane of the soft magnetic layer is positioned parallel to an air bearing surface (abs) of the magnetic head. In another embodiment, a method for forming a magnetic head includes forming a magnetoresistive sensor having a free layer above a substrate and forming a soft magnetic layer adapted to control a magnetization direction of the free layer and a magnetic domain of the free layer, wherein a close-packed plane of the soft magnetic layer is positioned parallel or oblique to an abs of the magnetic head.. ... Hgst Inc

01/22/15 / #20150024597

Method for sidewall spacer line doubling using polymer brush material as a sacrificial layer

A method for sidewall spacer line doubling uses sacrificial sidewall spacers. A mandrel layer is deposited on a substrate and patterned into mandrel stripes with a pitch double that of the desired final line pitch. ... Hgst Inc

01/15/15 / #20150017480

Perpendicular magnetic recording medium

A magnetic recording medium includes an amorphous buffer layer, a hybrid layer including a barrier layer, and a texture control layer. The magnetic recording medium also includes a heat sink layer, an under layer, and a perpendicular recording layer.. ... Hgst Inc

01/15/15 / #20150016187

Asymmetric log-likelihood ratio for flash channel

Disclosed is a system and method for reading a flash memory cell with an adjusted read level. A current read level is set to a new read level associated with increasing a first error rate to decrease a second error rate. ... Hgst Inc

01/15/15 / #20150015995

Hard disk drive spindle motor cup

Approaches to maintaining hard disk drive spindle motor rigidity and performance in low profile hdd devices comprise using an enclosure base with a bottom opening in which a separate motor cup is fitted and configured to support the spindle motor. The motor cup may then be fabricated using a different material than the enclosure base, such as a material having a higher modulus of elasticity than that of the base. ... Hgst Inc

01/08/15 / #20150010780

Current-perpendicular-to-the-plane (cpp) magnetoresistive sensor with multilayer reference layer including a crystalline cofex layer and a heusler alloy layer

A current-perpendicular-to-the-plane giant magnetoresistance (cpp-gmr) has a multilayer reference layer containing a heusler alloy. The multilayer reference layer includes a crystalline non-heusler alloy ferromagnetic layer on an antiferromagnetic layer, a heusler alloy layer, and an intermediate crystalline non-heusler alloy of the form cofex, where x is one or more of ge, al, si and ga, located between the non-heusler alloy layer and the heusler alloy layer. ... Hgst Inc

01/08/15 / #20150010143

Systems and methods for signature computation in a content locality based cache

The present disclosure relates to methods and circuits for signature computation in a content locality cache. A method can include dividing a received block into shingles, where each shingle represents a subset of the received block. ... Hgst Inc

01/08/15 / #20150009591

Streamlined voice coil actuator for hard disk drive

Approaches to improving head positioning accuracy in a hard disk drive, by reducing air pressure fluctuations that would otherwise cause unwanted coil torsion in a voice coil actuator, include a voice coil actuator having a streamlined structure configured to affect the flow of air acting upon a coil-supporting arm. The streamlined structure comprises an upper surface and a lower surface, where the upper surface is sloped downward toward the lower surface and the lower surface is sloped upward toward the upper surface.. ... Hgst Inc

01/01/15 / #20150002961

Scissor magnetic sensor having a back edge soft magnetic bias structure

A scissor type magnetic sensor having a soft magnetic bias structure located at a back edge of the sensor stack. The sensor stack includes first and second magnetic free layers that are anti-parallel coupled across a non-magnetic layer sandwiched there-between. ... Hgst Inc








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