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| Number | Title | Issue Date |
| 7271576 | Hand held antenna/network impedance analyzer A handheld portable battery powered digital antenna and/or network analyzer which derives complex impedance values at a given frequency includes an internal direct digital synthesis generator and provides software-defined multiple operating modes and real time graph... | 09/18/2007 |
| 6875384 | Precision article molding methods and apparatus An improved molding apparatus and method includes an adjustable mold component and a fixed mold component for molding precision articles; a bias force mechanism for applying a bias force to the adjustable mold component; and an adjustable mold component fine positio... | 04/05/2005 |
| 6236513 | Integrated objective/solid immersion lens for near field recording An objective-solid immersion lens assembly includes a unitary solid immersion lens body having an optical axis, an evanescent wave-conducting region along the optical axis, and a substantially spherical surface portion surrounding the optical axis opposit... | 05/22/2001 |
| 6216148 | Adaptive analog equalizer for partial response channels A single analog filter structure within a partial response channel combines an antialias low pass filter and a time domain waveform shaping equalizer upstream of a digital sampler. The filter also improves latencies associated with timing acquisition of a... | 04/10/2001 |
| 6108162 | Low profile disk drive architecture with in-line circuit board and flex circuit pressure pin connector A hard disk drive includes a spindle motor flex circuit having a connection end secured to a drive base at a location established by a reference feature and an actuator flex circuit having a connection end also secured to the base at the location establis... | 08/22/2000 |
| 6088192 | Roll-biased head suspension for reduced track misregistration A method corrects track misregistration attributable to out-of-plane motions of a rotating disk in a hard disk drive, and includes the steps of measuring a base plate-roll-bias angle between the rotating data storage disk and the head arm with a precision... | 07/11/2000 |
| 6051990 | Asymmetric current mode driver for differential transmission lines A driver circuit drives a digital signal onto a differential digital data transmission bus nominally biased to a negative data state during bus idle intervals by a weak negation bias current. The driver circuit overcomes the negation bias current during a... | 04/18/2000 |
| 6038102 | Conductor trace array having interleaved passive conductors A trace conductor array includes an electrically insulative support substrate and a plurality of electrical signal trace conductors formed along substantially parallel paths in a single layer on the substrate. The electrical signal trace conductors each h... | 03/14/2000 |
| 5995328 | Multi-layered integrated conductor trace array interconnect structure having 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 ... | 11/30/1999 |
| 5949357 | Time-varying maximum-transition-run codes for data channels A data channel, such as a magnetic recording/playback channel implements a time-varying maximum-transition-run code such that the code allows three consecutive transitions while it removes a dominant plus-minus-plus error-event and does not permit of four... | 09/07/1999 |
| 5939926 | Integrated circuit output driver for differential transmission lines An integrated circuit driver chip includes an on-board precision current reference source, a pull-up FET and a pull-down FET having a common node connected to a transmission line. A variable switching edge pre-driver drives at least one of the pull-up FET... | 08/17/1999 |
| 5917670 | Method for recovering data from disk with magneto-resistive head in presence of thermal asperities Momentary contact with a defect site of a data storage disk or free particle by a magnetoresistive read element of a flying head causes momentary heating and unwanted increase in element resistance (thermal asperity) which can disrupt hard disk drive data... | 06/29/1999 |
| 5886842 | Control loops for low power, high speed PRML sampling data detection channel A power-reduced digital control within a feedback control loop of a sampling data detection channel controls a predetermined operating parameter of the channel in which an analog to digital converter provides digital samples of information in the channel ... | 03/23/1999 |
| 5883864 | Media library having locally vectored drive addressing Media unit access time within a media library is minimized by revectoring an address of a closest available media unit player to match a logical address of a media unit player specified within a media exchange command received from a host commanding the l... | 03/16/1999 |
| 5862014 | Multi-channel magnetic tape head module including flex circuit A flex circuit for a tape drive includes an elongated flexible printed circuit substrate carrying a pattern of electrical circuit interconnections and divided into a read channel portion for direct connection to multiple read and write heads of a tape hea... | 01/19/1999 |
| 5862005 | Synchronous detection of wide bi-phase coded servo information for disk drive A magnetic disk drive data storage disk defines recording tracks divided into data sectors by narrow servo spokes. A data sector lying between servo spokes is recorded with user data encoded in accordance with a code having a predetermined distance and us... | 01/19/1999 |
| 5841600 | Randomly ordered data block envelope tape format A method of writing data onto a magnetic tape storage medium in the form of data blocks and error correction code blocks. Data is received from a data source and formatted into data and error correction code blocks. Data entities are created from the data... | 11/24/1998 |
| 5798623 | Switch mode sine wave driver for polyphase brushless permanent magnet motor A switch mode sine wave driver circuit selectively sources and sinks driving currents to and from a DC brushless motor in accordance with the substantially sinusoidal switched driving signals. A signal waveform monitoring circuit monitors electrical signa... | 08/25/1998 |
| 5778009 | Dedicated ALU architecture for 10-bit Reed-Solomon error correction module A system architecture for implementing a 10-bit Reed-Solomon code for detecting and correcting data errors in a single code word to protect a data block containing up to 1023 10-bit data symbols, i.e., the equivalent of up to 1278 8-bit symbols, including... | 07/07/1998 |
| 5771131 | Tracking in hard disk drive using magnetoresistive heads An asymmetric quadrature-providing servo burst format for a tracking servo within a hard disk drive is particularly well suited for MR heads. The four-burst format may be written onto the disk with only two servo-writer passes per track by using an altern... | 06/23/1998 |
| 5757822 | Bit-interleaved rate 16/17 modulation code with three-way byte-interleaved ECC A modulation method generates a rate 16/17 (d=0, G=7/I=11) modulation code for transferring user digital data bytes having a three-way ECC interleave through a data transfer channel in accordance with the steps of: shuffling the user data bytes in order to rea... | 05/26/1998 |
| 5758188 | Synchronous DMA burst transfer protocol having the peripheral device toggle the strobe signal such that data is latched using both edges of the strobe signal A synchronous DMA burst transfer method is provided for transferring data between a host device and a peripheral drive device connected by an ATA bus. The method provides synchronous data transfer capability in an asynchronous system by having one device ... | 05/26/1998 |
| 5737342 | Method for in-chip testing of digital circuits of a synchronously sampled data detection channel An on-chip self-test circuit for testing digital elements of a synchronous sampling data detection channel chip, such as a PRML channel of a hard disk drive, with digital pseudo samples representative of samples coming from an analog channel section, incl... | 04/07/1998 |
| 5737144 | Switched boost voltage generator for actuator retract in disk drive A voltage boost circuit within a hard disk drive is realized by switching a center tap node of a three phase spindle motor to ground during a power down sequence, thereby employing inductance of the spindle motor as a voltage boost inductor. The boosted v... | 04/07/1998 |
| 5734598 | Low power filter coefficient adaptation circuit for digital adaptive filter An adaptive filter for use in disk drive systems includes coefficient adaptation circuitry operating at a slower rate than the filter and consequently at a reduced power level. The adaptive filter receives input data samples corresponding to raw data read... | 03/31/1998 |
| 5729718 | System for determining lead time latency as function of head switch, seek, and rotational latencies and utilizing embedded disk drive controller for command queue reordering A method for reordering a queue of disk storage input/output (I/O) transfer commands for a hard disk drive. "Lead time" latencies are calculated for the commands in the queue with respect to the active command. The command with the least lead time latency... | 03/17/1998 |
| 5717547 | Multi-trace transmission lines for R/W head interconnect in hard disk drive An integrated transmission line array of multiple interleaved trace conductors symmetrically formed in a single plane for electrically interconnecting a read element or a write element of a dual element read/write head to a preamplifier circuit in a disk ... | 02/10/1998 |
| 5712636 | Pulse-width-modulated digital-to-analog converter with high gain and low gain modes A pulse-width-modulated digital-to-analog converter is responsive to a digital control value for switching between a high gain mode and a low gain mode. The converter includes a free-running rollover counter, a reference register and a comparator. Pulses ... | 01/27/1998 |
| 5689532 | Reduced complexity EPR4 post-processor for sampled data detection An EPR4 detector comprises a PR4 Viterbi detector and an EPR4 post-processor for improving estimated output sequence at an output of the PR4 Viterbi. The PR4 Viterbi detector produces digital estimates of coded digital information values into the channel ... | 11/18/1997 |
| 5680570 | Memory system with dynamically allocatable non-volatile storage capability A memory system having volatile storage of data destined for secondary storage and smaller intermediate non-volatile storage of some of the data. The volatile memory is an array of DRAM storage devices integrated with the non-volatile memory array of SRAM... | 10/21/1997 |
| 5671389 | Adaptive compression caching for tape recording A method selectively compresses data entering a data storage device, such as a digital linear tape drive, based upon whether a data level of a device cache buffer is above a predetermined watermark reference level. If the data level is above the predeterm... | 09/23/1997 |
| 5661760 | Wide biphase digital servo information detection, and estimation for disk drive using servo Viterbi detector A synchronous sampling data detection channel includes a data transducer head positioned by a servo-controlled actuator over a recording track of a rotating data storage disk, a preamplifier for receiving electrical analog signals magnetically induced by ... | 08/26/1997 |
| 5634724 | Hydrodynamic bearing for spindle motor having high inertial load A self-contained hydrodynamic bearing unit includes a shaft having a threaded axial opening at one end thereof and a shaft shoulder adjacent the opening and perpendicular with a longitudinal axis of the shaft, a sleeve defining an opening for receiving th... | 06/03/1997 |
| 5635933 | Rate 16/17 (d=0,G=6/I=7) modulation code for a magnetic recording channel A method for encoding a sequence of 16 bit digital data words into a sequence of 17 bit codewords in consonance with predetermined minimum zero run length (d), predetermined maximum zero run length (G) and maximum interleave zero run length (I) coding con... | 06/03/1997 |
| 5633770 | Digital output magnetoresistive (DOMR) head and methods associated therewith A digital output magnetoresistive ("DOMR") head for magnetic playback comprising one or more "pinned" magnetic layers having magnetic polar direction which does not rotate under an external field from the media, and a magnetic digital switching layer form... | 05/27/1997 |
| 5631788 | Flex circuit for head and disk assembly A flexible circuit construction is provided for connecting stationary electrical components to electrical components of a moving actuator within a head and disk assembly of a disk drive. The flexible circuit is integrally formed from a plastic film materi... | 05/20/1997 |
| 5608584 | Recognition of tape recording media type using plural in-line holes 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... | 03/04/1997 |
| 5603063 | Disk drive command queuing method using two memory devices for storing two types of commands separately first before queuing commands in the second memory device Automatic disk drive command reception by an interface ASIC circuit from a host without firmware intervention lowers host-disk bus overhead. Separate command manipulation is used to build a command queue subject to performance enhancing features. The inte... | 02/11/1997 |
| 5591073 | Method and apparatus for lapping sliders A method and apparatus for lapping the air bearing surfaces of hard disk head sliders including the steps of installing a lapping plate charged with lapping abrasive onto a lapping contour plate, applying a negative pressure to a cavity of the lapping con... | 01/07/1997 |
| 5583705 | Write precompensation optimization in a PRML channel using a selected PRML signal level Write precomposition optimization for a partial response maximum likelihood ("PRME") magnetic recording chapel adapted to a mass production environment. Optimal write precompensation may be determined by writing a tribit data pattern known to produce wors... | 12/10/1996 |
