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6084734 |
Data recovery using targeted ECC correction
An apparatus for correcting read errors in a disk drive is disclosed. In one embodiment, the apparatus includes circuitry for determining that an undesired distortion exists in a data signal read...
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6084732 |
Method of selecting zone lay-out of a hard disk drive on basis of head/recording medium performance
A method of selecting a zone lay-out of a hard disk drive on the basis of head/recording medium performance, which method includes (a) setting a reference position of each of the magnetic heads to...
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6075664 |
Write current setting method, and recording and reproducing device
A write current is set to be an optimum write current. The write current is supplied to a recording head when information is recorded on a recording medium. First margin characteristics are...
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6075666 |
Tape servo pattern having an embedded position count field
A servo stripe pattern for determining the longitudinal position of the tape with respect to the tape head. A data field on each frame of the servo pattern includes a digital one or a zero. An...
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6072649 |
Constant density recording method and system for headless format in hard disc driver
A method of and a system for efficiently using split information stored in an unnecessary data sector, thereby reducing unnecessary data. The system includes first registers respectively adapted to...
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6069758 |
Technique for reducing read channel optimization time
A hard disk drive with a reduced read channel optimization test time and a reduced test time difference determines whether or not the time limit for testing the hard disk drive has elapsed whenever...
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6069856 |
Information recording/reproduction method and apparatus using EPRML connection processing system using concatenated demodulators
An information recording/reproducing apparatus includes first and second data demodulators having different data discriminating capabilities. The first data demodulator has a lower data...
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6069760 |
Method of eliminating wiggle noise for a disk driving/recording apparatus
A method of eliminating a wiggle noise generated by a data write current applied to a thin-film head during a data write operation in a disk drive storage apparatus having a storage medium on which...
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6064538 |
Biasing/erasing oscillation circuit for magnetic tape recording apparatus
A biasing/erasing oscillator includes a series circuit formed by an entire-width erasing head, a linear record erasing head and an inductor. The series circuit is connected in parallel with an...
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6055118 |
Holding automatic gain control levels during read error recovery in a disc drive
An apparatus and associated method are disclosed for recovering user data from a data block in a disc drive in which user data are stored by way of a plurality of blocks on tracks of a disc, the...
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6052248 |
Parity channel code for enhancing the operation of a remod/demod sequence detector in a d=1 sampled amplitude read channel
A sampled amplitude read channel is disclosed for disk storage systems employing a run-length limited (RLL) d=1 channel code which compensates for partial erasure, and a parity channel code for...
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6052241 |
Method and apparatus for minimizing erasure errors during information recording/reproducing
An information recording/reproducing apparatus for recording information signals on a recording medium as a track pattern having two tracks adjacent to each other, and for reproducing the...
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6049439 |
Data error recovery using reduced speed
A method and apparatus for improving the data readability in a disk drive is described. The disk drive uses an error recovery mode in which the rotational speed of the motor is decreased below the...
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6046871 |
Magnetic recording head slider with piezoelectric sensor for measuring slider to disc interference levels
A magnetic recording head for use in a disc drive system including a rotating disc has a slider body and a transducer on the slider body for reading and/or writing data from and/or to the disc. A...
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6046873 |
Magnetic recording and reproducing apparatus including a viterbi detector having a variable reference amplitude value
A magnetic recording and reproduction apparatus, includes a circuit for changing a reference amplitude value of a Viterbi detector. The circuit is used to record and reproduce data with the...
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6046874 |
Reproduction apparatus using multiple partial response maximum likelihood detection systems
A first equalizer of a partial response system such as PR4 and a second equalizer of an extended partial response such as EPR4 are provided and are switched by a selector to the equalizer in which...
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6043946 |
Read error recovery utilizing ECC and read channel quality indicators
An apparatus and method for recovering from read errors detected by a read channel (70) in a sequence of data read from a disc (18) of a disc drive (10) by using read channel quality indicators to...
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6043945 |
Recording/reproducing device and method of replacing defective sector on media
A device for recording and reproducing data on a recording media includes an error detecting unit for detecting a defective sector by reading the data from the media, a data copying unit for...
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6040953 |
Adaptive data recovery method and means tuned to thermal asperities in a cyclic, multitracked magnetic storage subsystem
A method and system for resolving error or erasure in binary data streams read back using MR heads from a cyclic, multitracked recording medium. The method assesses whether an erasure or error was...
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6038092 |
System for reading data from a distorted magnetic tape media
A characteristic of helical scan tracks is that a distortion that occurs in the written data tracks is not uniform over the entire length of the track. Therefore, segments of the helical scan track...
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6034828 |
Recording of reproducing apparatus
A recording and reproducing apparatus reproduces a digital information signal and a control signal from a memory device, which is integrally formed of different kinds of memories and, according to...
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6034831 |
Dynamic reverse reassign apparatus and method for a data recording disk drive
A data recording disk drive is provided with a reassignment architecture that employs both an "in-line" approach for small disk defects and an "off-site" reassignment for multiple-sector defects....
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6031673 |
Servo band verification in linear tape systems having timing-based servo formats
A device for formatting a linear data storage tape includes a servo write head configured to write a pattern of magnetic transition stripes along a servo band of the linear data storage tape. The...
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6025971 |
Magnetic disk drive using a nonvolatile solid state memory to store defect information
A magnetic head drive of the present invention comprises a composite magnetic head structured by integrally combining a write head into a record head and a magnetic disk having a servo area where...
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6025966 |
Defect management for automatic track processing without ID field
A defect management system for use in a data storage system. The defect management system generates a track defect list comprising a sector defect record for each of a set of defective sectors in a...
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6023383 |
Error estimation circuit and method for providing a read channel error signal
A read channel (18) for use in a mass storage system is provided. The read channel (18) includes a plurality of circuit modules circuit and an error estimation circuit (50). The plurality of...
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6023387 |
Method and apparatus for determining sector addresses from media having data written in a headerless format
Disclosed is a method for determining an exact address of sectors retrieved from a media that is formatted in a headerless format. The method includes the acts of requesting a desired sector....
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6021011 |
Synchronous read channel employing a digital center frequency setting for a variable frequency oscillator in discrete time timing recovery
A synchronous read channel is disclosed which samples an analog read signal from a magnetic read head positioned over a magnetic disk medium, filters the sample values according to a desired...
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6021012 |
Automatic servo address mark detection and servo timing compensation circuit
An automatic servo address mark detecting and servo timing compensating circuit of a disk drive includes a servo address mark detection window generating unit for generating a servo address mark...
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6018428 |
Method and apparatus for recovering read errors due to thermal asperities in a disk drive having an MR head
The invention provides a method for effectively removing the cause of a thermal asperity (TA) phenomenon occurring at an MR head incorporated in a disk storage system. If a read error occurs in...
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6016463 |
Channel quality monitor for read channel IC
The present invention discloses a method and apparatus for monitoring a read channel in a disk drive system and calibrating the disk drive system. A comparator is provided to detect the data...
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6014277 |
Multipath channel apparatus and method using offset parameters to compensate for amplitude and timing errors in data storage devices
A multipath channel apparatus for a data storage device wherein data is stored on a storage medium and is read from the storage medium by a transducer or for a data communications system wherein...
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6009550 |
PBA recovery apparatus and method for interleaved reed-solomon codes
The present invention pertains to a method for determining if data read from a storage medium has been read from physical block address (PBA) other than the expected PBA. Data that is stored on the...
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6005727 |
Servo decoder for decoding an error correcting servo code recorded on a disc storage medium
A servo decoder is disclosed for disc storage systems that operates according to a novel coding scheme capable of accurately decoding detected codewords representing servo track address during seek...
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6005731 |
Channel quality circuit employing a test pattern generator in a sampled amplitude read channel for calibration
A channel quality circuit, incorporated within a sampled amplitude read channel utilized in a magnetic storage system, for processing and accumulating performance data from the individual read...
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6002836 |
Recording and reproducing apparatus in which digital data having various transmission rates are processed at their optimum data rates
A recording and reproducing apparatus according to the invention has: at least a pair of rotary heads having different azimuth angles; a run controller for controlling the run of the magnetic tape;...
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6000052 |
Signal conditioning system for controlling data retrieval channel characteristics in which errors in samples are segregated by association with intended sample values to control selected characteristics
A signal conditioning system for controlling characteristics of an analog signal obtained from magnetically stored data through a data retrieval channel that asymmetrically affects analog signal...
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5999354 |
Method and apparatus for recording/reproducing digital data and header information to/from areas of a tape record medium
Even if a read error of data in a tape management area takes place due to a scratch on the tape, the management area data can be securely restored by the retry process.Assume that the initial value...
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6000047 |
Scanning memory device and error correction method
A high-data density, high-data rate scanning memory device reads and writes data using a plurality of probes. The scanning memory device comprises a memory composed of a matrix of cell arrays each...
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5995306 |
Handling defective frames on hard sectored magnetic tape
Method and apparatus are provided for re-recording of a frame on magnetic tape (22) when a first recording of the frame is determined to be defective. A frame whose first recording is defective is...
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5995308 |
Disk resident defective data sector information management system on a headerless magnetic disk device
A disk resident system for managing defective data sector information in a defective data sector map in a headerless format magnetic disk device. The defective data sector map is stored in gaps...
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5995305 |
Disk drive using off-track margin to obtain optimal performance parameters
Adaptive channel optimization in a disk drive is achieved by selecting a track of the recording medium and then writing a first data pattern to opposite sides of the selected track. The first data...
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5991501 |
Apparatus and method for recording and reproducing digital signals on first and second areas of a storage medium
A digital signal is recorded along tracks on a recording medium. Each of the tracks has plural areas. A portion of the digital signal which is recorded on a first area out of the plural areas...
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5991108 |
Recording and reproducing apparatus
In a recording and reproducing apparatus having a simultaneous reproducing function, an adaptive filter outputs a pseudo crosstalk signal which approximates to frequency characteristics of...
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5986835 |
Control apparatus and method for conveyance control of medium in library apparatus and data transfer control with upper apparatus
A end report of the unloading operation is issue to a host computer for a period of time after the start of the ejecting operation of a medium cartridge of a recording/reproducing unit based on an...
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5987400 |
System for monitoring the throughput performance of a disk storage system
In a disk storage drive having a CPU, a disk and an EEPROM, the CPU measures throughput performance. The CPU measures the throughput performance for a measured area provided on a data-recording...
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5987634 |
Channel quality circuit in a sampled amplitude read channel
A channel quality circuit, incorporated within a sampled amplitude read channel utilized in a magnetic storage system, for processing and accumulating performance data from the individual read...
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5986593 |
Reproducing apparatus, error correcting device and error correcting method
A reproducing apparatus comprises an error correcting means which includes first and second input circuits for inputting first and second coded data read out via different series separately, first...
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5982568 |
Apparatus for detecting error in magnetic head for use in disk storage system
A data storage system that uses a magnetic head assembly having a write head and a read head mounted on a slider to write on and read from a disk. A portion of the coil of the write head is used as...
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5982711 |
Device for reading data from or writing data to magnetic storage media and a method of positioning a tape head relative to the magnetic storage media
A device for reading data from or writing data to magnetic storage media, the device comprising a head having a plurality of read/write elements for reading data from or writing data to magnetic...
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