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| Number | Title | Issue Date |
| 6012839 | Method and apparatus to protect data within a disk drive buffer An architecture that utilizes the cross-check code associated with the error correction code in a data communications system as a data integrity code to protect data stored in a temporary storage buffer within a data channel. In a preferred embodiment, a ... | 01/11/2000 |
| 5894425 | Wireless secondary interface for data storage device A mass storage device includes a secondary bidirectional interface digital port connected to an embedded microcontroller, and a wireless communications path, such as an optical infra-red (IR) path, connected to the secondary bidirectional interface port f... | 04/13/1999 |
| 5841601 | Elimination of inter symbol interference-induced timing phase and gain steps at sector start in PRML digital magnetic data storage channel A method is provided for elimination of periodic inter symbol interference (ISI) resulting in timing phase steps and channel amplitude control steps occurring following a periodic preamble pattern, such as a 1/4T sine wave pattern and at the beginning of ... | 11/24/1998 |
| 5812344 | Suspension with integrated conductor trace array having optimized cross-sectional high frequency current density A head suspension has a segmented trace conductor array for electrically interconnecting a read/write head to electronic circuitry in a disk drive. Each trace segment has a predetermined generally rectangular cross-sectional area such that the intermediat... | 09/22/1998 |
| 5805799 | Data integrity and cross-check code with logical block address According to the invention, a data integrity code including logical block address ("LBA") and circuit implementation are provided. The code and implementing circuitry are utilized to enable data block LBA verification during a block transfer and retrieval... | 09/08/1998 |
| 5796543 | Data track pattern including embedded servo sectors for magneto-resistive read/inductive write head structure for a disk drive In a disk drive using a write-wide inductive write element and a read-narrow magneto-resistive read element within a head transducer assembly for writing and reading magnetic patterns on a rotating magnetic storage disk in a plurality of concentric tracks... | 08/18/1998 |
| 5796552 | Suspension with biaxially shielded conductor trace array A head suspension has an integrated multi-layer trace conductor array for supporting and electrically interconnecting a read/write head to electronic circuitry in a disk drive. The trace conductor array includes an integrally formed electrical shield whic... | 08/18/1998 |
| 5793559 | In drive correction of servo pattern errors Embedded servo sectors within a data track of a hard disk drive including a rotating data storage disk and a closed loop rotary actuator structure for positioning a data transducer head relative to the data track are written by a method including the step... | 08/11/1998 |
| 5790337 | Tape cartridge qualified by location, and identified by geometry, of type aperture A single reel tape cartridge includes a type of magnetic recording tape having characteristics which are identified to a cartridge tape handling system in accordance with size variation of a tape type hole following a beginning of tape (BOT) hole by a pre... | 08/04/1998 |
| 5784296 | Method and apparatus for spectral analysis in a disk recording system A method of performing spectral analysis of signals recorded by a magnetic recording or storage system is provided using a modified channel chip of the system. The modified channel chip enables measurement of harmonic components of the recorded signal. Th... | 07/21/1998 |
| 5768296 | ECC system supporting different-length Reed-Solomon codes whose generator polynomials have common roots A Reed-Solomon error-correction coding (ECC) scheme selectively supports two different-length codes to optimize the trade-off between error performance and the amount of disk space required to store protection symbols. The encoder contains two sets of alp... | 06/16/1998 |
| 5764165 | Rotated counter bit pulse width modulated digital to analog converter A pulse width modulated, digital-to-analog converter (PWM DAC) that includes a pulse generator for generating width modulated pulses in accordance with a digital control value is set forth. The generator includes a clock for generating a clocking signal, ... | 06/09/1998 |
| 5760995 | Multi-drive, multi-magazine mass storage and retrieval unit for tape cartridges A multi-drive, multi-magazine mass storage and retrieval unit for tape cartridges which automatically retrieves a selected one of a plurality of tape cartridges from one of a plurality of tape cartridge magazines for transfer to a selected one of a plural... | 06/02/1998 |
| 5757826 | Word-wise processing for reed-solomon codes A word-wise encoder circuit that processes word formatted data blocks in response to a word clock signal and generates redundancy in accordance with an 8 bit symbol code. The encoder is provided with two parallel data paths, each receiving one of the resp... | 05/26/1998 |
| 5752309 | Method and apparatus for precisely dimensioning pole tips of a magnetic transducing head structure A method and apparatus for processing a magnetic transducer which uses gallium ion beam milling to precisely define pole tip widths of the magnetic transducer. The gallium ion beam may be defocused to improve definition of the region which is damaged by g... | 05/19/1998 |
| 5754369 | Head suspension with self-shielding integrated conductor trace array A head suspension has an integrated self-shielding trace conductor array for supporting and electrically interconnecting a dual element read/write head to electronic circuitry in a disk drive. Write traces are placed proximately to the read traces and are... | 05/19/1998 |
| 5737152 | Suspension with multi-layered integrated conductor trace array for optimized electrical parameters A head suspension has an integrated multi-layer trace conductor array for supporting and electrically interconnecting a read/write head to electronic circuitry in a disk drive. The electrical micro strip transmission line characteristics of the conductor ... | 04/07/1998 |
| 5717544 | Pressure differential latch for a disk drive A pressure differential actuator latching apparatus for a disk drive device is provided. The latching apparatus includes a rotatable body portion, a rigid air vane portion and a latching trap. When a data storage disk of the disk drive is not being rotate... | 02/10/1998 |
| 5691856 | Apparatus and method for providing selective hysteresis for zero crossings of a disk drive spindle motor A hysteresis circuit for providing hysteresis for a degree of noise immunity when detecting zero-crossings of a hard disk drive. A comparator is used to detect the zero-crossings associated with one of the windings of the disk drive's spindle motor. When ... | 11/25/1997 |
| 5675196 | High speed ten pole/twelve slot D.C. brushless motor with minimized net radial force and low cogging torque A ten pole/twelve slot brushless DC motor for a disk drive spindle includes a base; a cylindrical rotor structure rotating relative to the base and a generally symmetrically slotted stator structure fixed about an axis of rotation. The rotor structure inc... | 10/07/1997 |
| 5668679 | System for self-servowriting a disk drive A servowriter capable of non-invasively servowriting a magnetic recording disk drive controls the drive's on-board electro-mechanical head-position actuator system and read/write interface to self-servowrite the target drive. A head within the drive is us... | 09/16/1997 |
| 5650896 | Low cost plastic overmolded rotary voice coil actuator A voice coil rotor is formed with a metal hub alignment insert for interiorly receiving an assembly of bearings and for exteriorly receiving and retaining at least two head arms against radial walls of an integral annular spacer ring portion. An overmolde... | 07/22/1997 |
| 5647255 | Expandable gasket for a head disk assembly of a disk drive An expandable gasket for a head disk assembly, wherein the gasket is initially formed having a geometry that maximizes the number of gaskets realized per sheet of material used. The gasket includes a series of spaced-apart thinned pivot regions and is exp... | 07/15/1997 |
| 5626941 | Thin film media for very low flying height/contact recording application A method of fabricating a thin film media onto a rigid substrate. The method includes texturing a pattern of depressions of uniform dimensions on a substrate surface leaving strain-free plateaus therebetween. A magnetic film, an overcoat, and a lubricant ... | 05/06/1997 |
| 5621590 | Actuator apparatus with plastic C-block An improved actuator apparatus is employed in a hard disk drive device for positioning read/write heads over tracks on a data storage disk of the disk drive. The actuator apparatus includes an all plastic C-block assembly providing the actuator apparatus ... | 04/15/1997 |
| 5606466 | Method for overlapping block read events in disk drive A new method for overlapping block read events in a disk drive having synchronously sampled data detection channels is presented. In particular, the new method is for overlapping read back processing by real-time and digital signal processing of first and... | 02/25/1997 |
| 5600502 | Elimination of inter symbol interference-induced timing phase steps at sector start in PRML digital magnetic data storage channel A method is provided for elimination of periodic inter symbol interference (ISI) resulting in timing phase steps and channel amplitude control steps occurring following a periodic preamble pattern, such as a 1/4 T sine wave pattern and at the beginning of... | 02/04/1997 |
| 5587850 | Data track pattern including embedded servo sectors for magneto-resistive read/inductive write head structure for a disk drive In a disk drive using a write-wide inductive write element and a read-narrow magneto-resistive read element within a head transducer assembly for writing and reading magnetic patterns on a rotating magnetic storage disk in a plurality of concentric tracks... | 12/24/1996 |
| 5576906 | Synchronous detection of concurrent servo bursts for fine head position in disk drive Synchronous detection of fine position servo burst information with a data transducer having an electrical width not less than about two-thirds a width of a data track within a partial response maximum likelihood (PRML) data channel is disclosed. The serv... | 11/19/1996 |
| 5566034 | Off-track detection with charge redistribution A/D circuits An apparatus for detecting off-track positioning of a disk read/write head seeking a selected data track on a disk having data tracks with embedded servo burst patterns recorded thereon. The apparatus comprises a compare and select component, a charge red... | 10/15/1996 |
| 5552942 | Zero phase start optimization using mean squared error in a PRML recording channel A "zero phase start" optimization circuit for a Partial Response, Maximum Likelihood ("PRML") data channel dynamically determines a more optimal starting phase for the timing recovery process in a synchronous communication or storage system. The disclosed... | 09/03/1996 |
| 5543985 | "Acton" load beam for a winchester disk drive A suspension load beam for a rigid disk drive. The load beam has a central load beam member having a flexure supporting surface and an opposing surface, and rails disposed along the sides of the central member. The rails form channels extending away from ... | 08/06/1996 |
| 5541791 | Air guide for an aerodynamic actuator latch within a disk drive In a disk drive, a stationary air guide for channeling windage flowing proximate a surface of a single rotating disk toward an air vane of an air vane actuator latch. The air guide has two members, a first member is positioned partially over an upper surf... | 07/30/1996 |
| 5526208 | Flex circuit vibration sensor A method and apparatus for sensing vibration in a flex circuit located between a rotary actuator and electronics within a disk drive. Specifically, the apparatus contains a strain gauge attached to or imbedded within the flex circuit. The resistivity of t... | 06/11/1996 |
