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| Number | Title | Issue Date |
| 7787213 | Disk drive flow control plate with integrated air management features A flow control plate (152) for a disk drive is disclosed. The flow control plate (152) includes both a diffuser section (156) and an air displacement section (168). The diffuser section (156) is contained within a pocket (160 | 08/31/2010 |
| 7739788 | Support structure with integral retainer tabs for use in spindle motor wire routing A base plate for magnetic disk drives is provided that includes a hooked protrusion integrated therein between adjacent spindle motor coils. The cross-over wires that span between adjacent coils are secured by the hooked protrusions, thereby optimizing coil height a... | 06/22/2010 |
| 7646566 | Slider deformation control by thermal-structural compensators A disk drive includes a drive circuitry, a storage disk, a suspension and a slider. The slider is supported by the suspension and receives electrical current from the drive circuitry. The slider includes a flying side that generally faces the storage disk, a read/wr... | 01/12/2010 |
| 7636222 | Tuned mass actuator arms for decreasing track misregistration in a depopulated head suspension disk drive A disk drive includes a storage disk having a data surface, a head suspension assembly, an actuator assembly and an E-block. The actuator assembly moves the E-block relative to the storage disk. The E-block includes a first actuator arm and a second actuator arm. Th... | 12/22/2009 |
| 7633709 | Disk drive baseplate with cooling ribs A disk drive base plate (150) that incorporates a plurality of cooling ribs (170) on its bottom (154) is disclosed. In the illustrated embodiment, all of these cooling ribs (170) are disposed in parallel relation, and are oriented paralle... | 12/15/2009 |
| 7596196 | Timing recovery in error recovery for iterative detection A decoding system includes a timing loop for use in error recovery mode operations, in which “fast decode” bit values that are used for timing recovery purposes in the normal modes of operation are replaced, at an appropriate iteration in the error recovery mode... | 09/29/2009 |
| 7588842 | Perpendicular magnetic recording medium with a pinned soft underlayer A magnetic recording medium and a magnetic recording apparatus for perpendicular magnetic recording. The recording medium includes a magnetically soft underlayer and a hard magnetic pinning layer having perpendicular anisotropy. The magnetically soft underlayer is s... | 09/15/2009 |
| 7573683 | Write heads with floating side shields and manufacturing methods A write head for a media drive suited for perpendicularly recording data in adjacent magnetic recording media, the media having a magnetic recording layer and a soft underlayer (SUL). The write head has a pole tip, a write yoke connected to the pole tip, a write ret... | 08/11/2009 |
| 7573674 | Storage disk having increased damping characteristics in a disk drive A disk drive includes a drive housing and a storage disk rotatably coupled to the drive housing. In one embodiment, the storage disk includes a first substrate, a spaced-apart second substrate, a damping layer and a rigid substrate spacer. The first substrate is for... | 08/11/2009 |
| 7559008 | Nested LDPC encoders and decoder An LDPC encoding system produces an encoded block by encoding the data as i data sub-blocks using an LDPC code H1, XOR'ing the H1 sub-block code words to generate a block code word and further encoding the block code word using an LDPC code H | 07/07/2009 |
| 7555070 | Parallel maximum a posteriori detectors that generate soft decisions for a sampled data sequence A soft decision value output detector includes a plurality of maximum a posteriori (MAP) detectors. The MAP detectors are connected in parallel, and configured to simultaneously generate state metrics for portions of a sampled data sequence, and to generate soft dec... | 06/30/2009 |
| 7529055 | Writing reference patterns in a disk drive using back EMF based timing signals compensated for repeatable variation therein An apparatus is provided for writing reference patterns on a data storage disk of a disk drive. The disk is rotated by a spindle motor. A back EMF sense circuit generates a sequence of zero crossing signals from back EMF sensed on windings of the spindle motor over ... | 05/05/2009 |
| 7525753 | Reducing seek wind-up in a disk drive using early acceleration feedforward signal Methods of controlling a transducer that is adjacent to a rotatable data storage disk in a disk drive are disclosed, the disk drive having an actuator configured to position the transducer, a rotational acceleration sensor configured to generate a rotational acceler... | 04/28/2009 |
| 7515385 | Band pivot bearing A pivot bearing for an actuator assembly of a disk drive includes a first stationary member, a second pivoting member, and a third flexible member interconnecting the first and second members. The first stationary member is secured preferably between the base and to... | 04/07/2009 |
| 7515371 | Channel postamble extension to de-gauss pole tips A technique for de-gaussing the pole tips and yoke of a write transducer in a perpendicular magnetic recording system is provided. An oscillator in the read channel is configured to produce an adjustable signal pattern output to the preamplifier when a write operati... | 04/07/2009 |
| 7489472 | High-order hybrid actuator controller A method of providing a control output by selecting a controller to an actuator is discussed. A first controller having an estimator-compensator architecture is selected if the actuator is in a settle stage. A second controller having an architecture other than that... | 02/10/2009 |
| 7486468 | Corrected read/write offset compensation A read trajectory and/or a write trajectory of a read/write head of a rotatable disk drive is adjusted using a compensation signal that compensates for a time-varying difference between the read trajectory and the write trajectory. ... | 02/03/2009 |
| 7486459 | Disk drive with performance driven head-to-disk spacing A disk drive for storing data includes a drive housing, a storage disk that is rotatably coupled to the drive housing, a slider assembly positioned near the storage disk, and a drive circuitry. The slider assembly includes a head that interacts with the storage disk... | 02/03/2009 |
| 7483227 | Detecting a thermal asperity condition of a disk drive head responsive to data value transitions Methods are disclosed for detecting a thermal asperity condition of a head that is configured to generate a read signal by reading data on a rotatable data storage disk in a disk drive. The read signal includes a data component and a thermal component. The read sign... | 01/27/2009 |
| 7474496 | Micro actuator DC gain calibration scheme for HDD dual-stage actuator systems A servo system for a hard disk drive comprising a first actuator, a second actuator, a head, and a disk on which is formed a plurality of tracks containing servo data. The servo system comprises a first stimulus, a second stimulus, and a calibration system. The firs... | 01/06/2009 |
| 7471509 | Shock protection for disk drive embedded in an enclosure A shock absorbing device for protecting a hard disk drive housing found primarily in portable electronic devices. The shock absorbers include protuberances that emanate from the body of the shock absorber and that extend through apertures provided in the enclosure. ... | 12/30/2008 |
| 7466782 | Methods, apparatus and computer program products for determining the timing of bits based on frequency error Determining timing for bits in sampled data includes determining a bit error in the sampled data, determining a phase error in the sampled data, determining a frequency error of the sampled data based on the bit error and based on the phase error, and determining th... | 12/16/2008 |
| 7453663 | Disk drives with servo burst patterns radially offset in different radial spokes of a disk and methods of positioning based thereon A disk drive includes a rotatable disk, a transducer, an actuator, and a controller. The disk includes a first servo burst pattern in a first radial spoke of the disk, and a second servo burst pattern in a second radial spoke of the disk. The first and second servo ... | 11/18/2008 |
| 7440208 | Flexible partial response targets for data detectors Automatically optimizing and programming features of a disk drive read channel for a selected partial response (PR) target. This enables flexible PR targets to be used in the read channel. The flexible PR targets can have arbitrary coefficients, and the channel feat... | 10/21/2008 |
| 7430704 | Trellis-based detection process and system A method for detecting signals affected by intersymbol interference provides for a path memory in the form of a trellis admitting survivor paths comprising a first and a second stage. The first stage includes a shift register exchange with a given number of states a... | 09/30/2008 |
| 7411389 | Method of detecting changes in operability status of a slider mover in a disk drive A method for monitoring the operability of a slider of a disk drive includes the steps of providing a slider that includes a read/write head that magnetically interacts with a storage disk, and a slider mover that adjusts a head-to-disk spacing, controlling an elect... | 08/12/2008 |
| 7404131 | High efficiency, error minimizing coding strategy method and apparatus A method for creating a high efficiency, error minimizing code is provided. In addition, an apparatus having a high efficiency, error minimizing code is provided. In particular, the present invention provides a high efficiency, error minimizing code for use in conne... | 07/22/2008 |
| 7400467 | Methods and apparatus for managing write inhibit in response to a predictive metric Methods of controlling reading/writing by a read/write head of a disk drive include generating a position error signal indicative of a displacement of the read/write head from a desired radial location on a surface of a data storage disk. A control signal for moving... | 07/15/2008 |
| 7382570 | Dynamically controlling seek profile in an acceleration tracking seek controller Methods of controlling seeking of a transducer that is adjacent to a rotatable disk in a disk drive are disclosed. The methods may include accelerating the transducer radially across the rotatable disk from an initial track on the rotatable disk toward a destination... | 06/03/2008 |
| 7378164 | Soft underlayer structure for magnetic recording A magnetic recording medium having a soft magnetic underlayer structure that includes two soft underlayers is presented. A thick first soft underlayer, disposed on the medium substrate, is made of material which provides a low magnitude of magnetization saturation (... | 05/27/2008 |
| 7372664 | Techniques to reduce adjacent track erasure including a write pole with a tip having faces at angles Techniques for reducing adjacent track erasure include: a bucking coil having a lower number of turns than the write coil for bucking out a portion of the field induced by the write coil; a hybrid solenoid coil that includes turns that are in a pancake arrangement a... | 05/13/2008 |
| 7370230 | Methods and structure for error correction in a processor pipeline Methods and structures for an improved processor pipeline to eliminate the effect of correctable soft errors on processor/memory pipeline performance. Features and aspects hereof provide that the pipeline is extended by the addition of one or more information correc... | 05/06/2008 |
| 7369345 | Mobile hard disk drive free fall detection and protection A system provided for protecting a disk drive from impact damages. More specifically, a disk drive is provided that includes an accelerometer interconnected to a printed circuit board that detects free fall of the disk drive. In addition, the velocity of spinning di... | 05/06/2008 |
| 7362536 | Disk drive that compensates for phase incoherence between radially adjacent servo tracks and methods thereof Methods of compensating for radial incoherence in servo information that is read from adjacent servo tracks that have a phase offset relative to one another on a data storage disk of a disk drive are provided. While a transducer is seeking to a target track, the tra... | 04/22/2008 |
| 7362534 | System for detecting a change in head-to-disk contact status in a disk drive A disk drive includes a rotatable storage disk, an actuator motor, a slider that magnetically interacts with the storage disk, and a drive circuitry. A portion of the slider moves between a first position wherein the slider does not contact the storage disk and a se... | 04/22/2008 |
| 7362529 | Disk drive with variable density data tracks A disk drive has multiple disk surfaces and corresponding heads, each disk surface includes multiple regions, and each head is for recording on and playback of information from a corresponding disk surface. The data track density in a first region on a first disk su... | 04/22/2008 |
| 7355804 | Disk drive partially autonomous preamplifier for write current parameters A disk drive includes a rotatable data storage disk, and head, a controller, and a preamplifier. The head is configured to write data to and read data from the disk. The controller is configured to generate a write current command. The preamplifier includes a plural... | 04/08/2008 |
| 7355814 | Disk texture located in load/unload zone of disk for cleaning contamination and disk lubricant from head ABS surface The present invention is directed to a load/unload disk drive that includes: a rotational arm engaging a slider; a magnetic storage disk, wherein the magnetic head in the slider reads data from and/or writes data t... | 04/08/2008 |
| 7352527 | Disk drive that balances seek speed and seek acoustics A disk drive selects seek speed and seek acoustics based on a history of seek requests from a host computer. The history of seek requests can include time intervals between seek requests, seek lengths of seek requests, locations of seek requests, a backlog of seek r... | 04/01/2008 |
| 7352525 | Hard disk drive fly height adjust method and apparatus during error recovery Data recovery, following a read error in a hard disk drive, is provided which includes an adjustment of fly height. In one embodiment, some re-reads are performed by both adjusting the fly height and the off-track positioning of the read head. In one embodiment, two... | 04/01/2008 |
