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Western Digital Technologies, Inc. Patents
Assignee:
Western Digital Technologies, Inc.
Address:
Lake Forest, CA
No. of patents:
837
Patents:


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Patent Number Title Of Patent Date Issued
D621282 Packaging sleeve August 10, 2010
D543981 Disk drive with Morse code patterned sleeve June 5, 2007
D542289 Disk drive enclosure with morse code pattern air vent May 8, 2007
8589773 Disk drive margining read channel by biasing log-likelihood ratios of an iterative decoder November 19, 2013
A disk drive is disclosed comprising a head actuated over a disk comprising a plurality of data tracks. A read signal emanating from the head is sampled to generate read samples, and first log-likelihood ratios (LLRs) are generated in response to the read samples. The first LLRs are
8582231 Disk drive determining head touchdown threshold based on curve fitting prediction error November 12, 2013
A disk drive is disclosed comprising a head actuated over a disk. An analog touchdown (TD) signal is compared to a TD threshold in order to generate a calibrated TD threshold for a plurality of different dynamic fly height (DFH) settings. The calibrated TD thresholds and corresponding
8582229 Pushpin assembly November 12, 2013
A pushpin assembly for a spiral track writer is provided. The pushpin assembly includes a body, a bushing, and a pushpin. The body mounts on a pushpin arm of a spiral track writer. A cavity is defined in the body and extends between a first opening and a second opening of the body. The
8582223 Methods and devices for two-dimensional iterative multi-track based map detection November 12, 2013
Decoding data written over a plurality of tracks includes selecting a mask that accounts for Inter-Symbol-Interference, the mask including channel coefficients and defining a trellis defining a plurality of states; receiving a signal corresponding to an input pixel from each of the p
8578242 Data storage device employing seed array for data path protection November 5, 2013
A data storage device is disclosed including a non-volatile memory comprising a plurality of memory segments. The LBAs of a read command are mapped to PBAs addressing the memory segments. At least two seed values corresponding to two of the LBAs are generated and stored in an array.
8578100 Disk drive flushing write data in response to computed flush time November 5, 2013
A disk drive is disclosed comprising a head actuated over a disk, a volatile semiconductor memory (VSM), and a command queue. A plurality of write commands received from a host are stored in the command queue, and write data for the write commands is stored in the VSM. A flush time n
8576511 Disk drive executing log structured writes to physical zones based on power mode November 5, 2013
A disk drive is disclosed comprising a head actuated over a disk comprising a plurality of physical zones including a first physical zone and a second physical zone, wherein the first physical zone comprises data tracks recorded at a first data rate and the second physical zone compr
8576509 Disk drive configuring dual fly height actuators during write operation November 5, 2013
A disk drive is disclosed wherein during a write operation a write fly height actuator is configured with a pre-heat value and a read fly height actuator is configured with a read value. When the head is over a target data sector, the write fly height actuator is configured with a first
8576506 Disk drive estimating reader/writer gap across servo zones November 5, 2013
A disk drive is disclosed comprising a head actuated over a disk comprising a plurality of servo sectors defining a plurality of servo tracks. The servo tracks form a plurality of servo zones. A disk locked clock is synchronized relative to a servo data rate of the servo zone the hea
8565511 Apparatus and method to align a manufacturing device having an end effecter and fixture in a par October 22, 2013
Disclosed is an alignment system comprising: an upper reflector to couple to an end effecter and a camera kit to couple to a fixture. The camera kit includes: a plurality of light sources; a camera; and a lower reflector including a camera opening and a plurality of light source open
8565053 Methods and devices for preventing media errors due to media scratches October 22, 2013
A method of operating a disk drive comprises scanning each Logical Block Address (LBA) of the disk drive to detect a read error or reading the LBA from a media defect list. The LBA may then be converted to a corresponding physical location on the media and a scan of the corresponding
8564899 Disk drive decreasing a settle delay based on speed that a settle parameter adapts October 22, 2013
A disk drive is disclosed comprising a head actuated over a disk comprising a plurality of tracks, and control circuitry operable to seek the head to a target track and settle the head on the target track during a settle time, adapt a settle parameter used to settle the head on the t
8561285 Methods and devices for picking and placing workpieces into small form factor hard disk drives October 22, 2013
A method of picking and placing a workpiece relative to a disk drive may include steps of providing a robotically controlled tool, a servo motor assembly for moving the tool, at least one controller for controlling the tool and the servo motor assembly, and a machine vision assembly coup
8300352 Disk drive having mounting inserts with cantilevered beams October 30, 2012
A novel disk drive includes a disk drive base that includes a plurality of mounting recessions. Each of a plurality of mounting inserts at least partially protrudes into a respective one of the plurality of mounting recessions, and contacts the disk drive base. Each of the plurality of
8300348 Disk drive detecting disk boundaries using microactuator October 30, 2012
A disk drive is disclosed comprising a disk, an actuator arm, a head coupled to a distal end of the actuator arm, a voice coil motor (VCM) operable to actuate the head over the disk in coarse movements by rotating the actuator arm about a pivot, and a microactuator operable to actuat
8300338 Disk drive correlating different fly height measurements to verify disk warpage October 30, 2012
A disk drive is disclosed comprising a disk surface, and a head actuated over the disk surface. A first fly height measurement is generated for the head over the disk surface by measuring a first metric, and a second fly height measurement is generated for the head over the disk surface
8295014 Disk drive head gimbal assembly having a flexure tail with transverse flying leads October 23, 2012
A head gimbal assembly for a disk drive includes a read head, a load beam, and a laminate flexure. The laminate flexure includes a structural layer, a dielectric layer, and a conductive layer that includes a plurality of electrical traces. The laminate flexure includes a tongue porti
8295013 Disk drive head stack assembly having a flexible printed circuit with heat transfer limiting fea October 23, 2012
A head stack assembly (HSA) for a disk drive includes an actuator body, at least one actuator arm extending from the actuator body, and a flexible printed circuit (FPC). The FPC includes first and second pluralities of electrically conductive FPC traces, each having a distal portion
8295012 Disk drive suspension assembly with rotary fine actuator at flexure tongue October 23, 2012
A head gimbal assembly includes a rotary fine actuator attached to the head mounting tongue. The rotary fine actuator includes a fixed portion, a head mounting platform, first and second piezoelectric elements, and first and second curved compliant members. The first piezoelectric el
8289656 Disk drive comprising stacked and stepped traces for improved transmission line performance October 16, 2012
A disk drive is disclosed comprising a disk, a head actuated over the disk, a preamp, and an interconnect for coupling the head to the preamp. The interconnect comprises a first transmission line stacked over a second transmission line, and a dielectric between the first transmission
8289646 Disk drive having a disk limiter that is disposed within an angular range relative to a base dep October 16, 2012
A disk drive includes a spindle that defines a spindle rotation axis, and a disk drive base that has a base depression bounded by a first base depression brim. A disk is attached to the spindle, and the disk includes a disk outer peripheral extent. The disk drive includes a disk limiter
8285965 Aligning data storage device partition to boundary of physical data sector October 9, 2012
A method of aligning a partition of a data storage device to a boundary of a physical data sector is disclosed. The data storage device comprises a non-volatile memory comprising a plurality of physical data sectors, wherein each physical data sector comprises a plurality of logical data
8285923 Disk drive and method using native command queuing tags to identify logical block size and imple October 9, 2012
"A disk drive is disclosed comprising a head actuated over a disk wherein a Native Command Queuing (NCQ) access command is received from a host. The NCQ access command comprises at least one logical block address (LBA) associated with a logical block, and a tag field for identifying the
8284514 Disk drive having a clamp fastener with a convex head October 9, 2012
Disclosed is a clamp fastener that includes a convex head to prevent damage due to contact from a cover of a disk drive. The disk drive comprises a disk, a spindle motor, a disk clamp mounted to a top surface of the disk, and a clamp fastener. The clamp fastener includes a convex hea
8281218 Data manipulation engine October 2, 2012
Data storage devices are provided according to various embodiments of the present invention. In one embodiment, a data storage device comprises a host interface, a buffer, a storage media interface, and a data manipulation engine. The data manipulation engine comprises a receive pipe
8279560 Head stack assembly with suspension tail bond alignment by solder pin October 2, 2012
A flexure tail of a head gimbal assembly (HGA) is aligned with a flex cable of a head stack assembly (HSA). At least one solder ball is adhered to a bond pad on the flex cable. The solder ball is entered into a first alignment hole in the flexure tail while the solder ball is solid.
8279550 Fly height sensor control circuit October 2, 2012
A disk drive is disclosed comprising a disk, a head for writing data to the disk, a first touchdown sensor, a second touchdown sensor, and control circuitry comprising a first current source coupled to the first touchdown sensor and a second current source coupled to the second touch
8276256 Head stack assembly method using flexure tail raised region October 2, 2012
A method of assembling a head stack assembly (HSA) includes securing a flex cable to an actuator including an actuator arm having a side slot with a slot end. A first head gimbal assembly (HGA) is attached to the actuator arm. The first HGA includes a first laminated flexure having a
8274760 Suspension assembly including a flexure tail with staggered rows of apertures September 25, 2012
Disclosed herein are embodiments directed to a head gimbal assembly including a novel suspension assembly that includes a flexure tail with a first plurality of apertures in its structural layer. Each of the first plurality of apertures underlies a first trace but not a second trace.
8271692 Throttled command completion time September 18, 2012
A storage device comprising a storage media and a controller is disclosed. The controller is configured to receive access commands from a host, to write data to or read data from the storage media based on the access commands, to detect a trigger event, and, when the trigger event is
8270118 Head stack assembly cartridge September 18, 2012
According to one aspect of the present disclosure, a head stack assembly cartridge is provided. The head stack assembly cartridge includes a base plate having a pivot shaft for pivotally mounting a head stack assembly and a base voice coil motor magnet attached to an inner surface of the
8267831 Method and apparatus for washing, etching, rinsing, and plating substrates September 18, 2012
An apparatus comprises a gear mechanism for imparting planetary motion about a central axle to a plurality of mandrels used for holding substrates in a process bath. The plurality of mandrels are mounted to a pair of end plates, the mandrels and end plates collectively comprise a car
8261012 Non-volatile semiconductor memory comprising power fail circuitry for flushing write data in res September 4, 2012
A non-volatile semiconductor memory is disclosed comprising a first memory device having a memory array including a plurality of memory segments, and a data register for storing write data prior to being written to one of the memory segments. A memory controller comprises a microproc
8259417 Disk drive head stack assembly having a flexible printed circuit with stiffener bend axis normal September 4, 2012
A disk drive head stack assembly has a flexible printed circuit (FPC) including a flex cable and a flex stiffener. The flex stiffener includes a terminal region support portion that is attached to the actuator body, a flex cable guide portion, and a stiffener bend. The stiffener bend is
8255661 Data storage system comprising a mapping bridge for aligning host block size with physical block August 28, 2012
A data storage system is disclosed comprising a non-volatile memory and a first interface operable to receive a write command from a host, the write command comprising a host write data block having a host logical block size. A block mapping bridge divides the host write data block into
8254222 Disk drive tuning dual stage actuator servo loop gains from open loop response at target frequen August 28, 2012
A disk drive is disclosed comprising a disk surface, a head coupled to a distal end of an actuator arm, and a dual stage actuator (DSA) servo loop comprising a voice coil motor (VCM) servo loop and a microactuator servo loop operable to actuate the head over the disk surface. The mic
8254172 Wear leveling non-volatile semiconductor memory based on erase times and program times August 28, 2012
A non-volatile semiconductor memory is disclosed comprising a memory device including a plurality of memory segments. A program command is issued to the memory device to program a memory segment, and a program time required to execute the program command is saved. An erase command is
8248733 Shipping comb and ramp for disk drive assembly August 21, 2012
A disk drive under assembly is disclosed that comprises a suspension assembly that includes a head gimbal assembly (HGA) that has a lift tab and a shipping comb that includes a protruding member that extends from the shipping comb and a bearing member that supports the suspension ass
8247095 Energy assisted discrete track media with heat sink August 21, 2012
A discrete track perpendicular magnetic recording (PMR) disk and a method of fabricating the disk are described. The PMR disk may include a heat sink layer disposed above a substrate, intermediate layers disposed above the heat sink layer, and a magnetic recording layer disposed above th
8245601 Screwdriver sleeve finder August 21, 2012
A screwdriver sleeve finder comprises a sleeve, a fastener stop, purge channels, and ports. The sleeve is mountable on a screwdriver around a bit for driving a threaded fastener. The fastener stop is disposed within the sleeve between a forward bore and a rearward bore, and defines,
8243525 Refreshing non-volatile semiconductor memory by reading without rewriting August 14, 2012
A non-volatile semiconductor memory is disclosed comprising a first memory device including a plurality of memory segments, and control circuitry operable to determine whether a memory segment in the first memory device needs refreshing, and when the memory segment needs refreshing,
8233239 Disk drive head stack assembly having first and second swage bosses with different inner lip pro July 31, 2012
A disk drive head stack assembly includes an actuator arm tip that includes a swaging hole centered about a swaging axis. A first suspension assembly has a first swage boss that protrudes into the swaging hole. A second suspension assembly has a second swage boss that protrudes into
8230570 Automatic gravity vacuum screw feeding July 31, 2012
An electric screwdriver is coupled to an automatic screw feeding adaptor defining a screw path having a proximal end, a middle region and a distal end. A first screw is received within the screw feeding adaptor and held at a driving position near the distal end of the screw path by apply
8228631 Disk drive having a stationary plate facing a disk and with a recirculation filter coupled to gr July 24, 2012
A novel disk drive includes a disk and a spindle motor to which the disk is attached to rotate about an axis of rotation. The disk drive also includes a stationary plate facing and disposed over the disk, wherein the stationary plate includes a plurality of grooves through which rota
8223453 Disk drive having a vibration absorber with fixed free ends July 17, 2012
A disk drive includes a disk drive base, a disk, an actuator arm actuatable over the disk, and a motor. The motor is operable to rotate the disk, and is coupled to the disk drive base. During operation of the disk drive, the motor emits vibrations at a source vibration frequency. A v
8223448 Disk drive calibrating preamp for servo sectors and data sectors July 17, 2012
A disk drive is disclosed comprising a head actuated over a disk including a plurality of tracks defined by servo sectors, wherein each track comprises a plurality of data sectors. The disk drive further comprises a preamp circuit operable to amplify a read signal emanating from the
8218268 Head gimbal assembly having a load beam aperature over conductive heating pads that are offset f July 10, 2012
A novel head gimbal assembly (HGA) for use in a disk drive is disclosed. Each of a plurality of electrically conductive traces of a flexure of the HGA includes a connection region that is aligned with and connected to a corresponding one of a plurality of electrically conductive bonding
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