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6429995 |
Position error signal calibration using measured bursts
A method, apparatus, and an article of manufacture for calibrating a position error signal for controlling the position of a read transducer with respect to a storage media having positioning...
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6426844 |
Method and apparatus for phase modulated servo positioning in a direct access storage device
A phase modulated servo method and apparatus are provided for use in a disk file. The disk file includes at least one disk mounted for rotation about an axis and the disk has at least one disk...
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6426845 |
Asynchronous analog demodulator and method for a null-type servo pattern
An asynchronous demodulator and method is provided which determines a position error of a read head relative to a position on a medium in a storage device. The read head generates a-read signal as...
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6424479 |
Magnetic disk having address information in a form which represents grey code between neighboring recording tracks and a reproducing apparatus therefor
A magnetic recording medium and a data reproducing apparatus are provided in which, with the use of a required number of bits, the address information may be reliably reproduced even during the...
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6421194 |
Disk drive head-select verification
A method of storing data on a surface of a storage disk, the data being capable of verifying an identity of the surface, includes determining first check data from first alignment correction data...
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6421195 |
Magnetic disk media with patterned sections
A magnetic disk medium patterned linear magnetic channels in a radial direction of the disk is employed in a magnetic disk drive unit. The magnetic channels are patterned by high-resolution...
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6414809 |
Data storage device servo control apparatus and method
A storage device with a disk-shaped recording medium having servo areas in which servo sectors are recorded and data areas in which data sectors are recorded; a read/write head to read and write...
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6411459 |
Advanced servo writing method for hard disc drives
A method of writing servo information for hard disc drives, and disc drives built according to the method are disclosed. The method includes writing position reference information on a reference...
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6411452 |
Disk drive employing read error tolerant sync mark detection
A hard disk drive has a pattern detector for providing fault-tolerant detection of a data sync mark represented by a substring of a concatenated string of error-prone read symbols and for providing...
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6404582 |
Robust index reference position detection using a sequence of successively disposed index fields
Apparatus and method for improving index reference position detection on a disc of a disc drive. The disc includes servo fields used by a servo circuit to control position of a head adjacent the...
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6400523 |
Method and apparatus for recording and reproducing disk-type recording medium with dual head including reading head and writing head having offset cores
A magnetic disk recording and reproducing apparatus comprising a unit for inserting an error correcting code related to control information into said control information on data; a recording...
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6396654 |
Embedded servo writing method and apparatus for hard disk drive
A method and apparatus for writing a servo signal for controlling the position of a head on a disk during the manufacture of a hard disk drive. The present invention provides a method and apparatus...
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6392831 |
Identification of defective servo information elements in a disc drive system
A method and disc drive system identify defective servo information elements on a disc. Servo information elements are read from the track on the disc to receive first servo data status values...
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6388829 |
High servo sampling disk drive with minimum overhead
A disk drive having multi-burst servo wedges and single-burst servo wedges for improving shock performance with less impact on data space than otherwise possible and a method of increasing the...
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6384998 |
Multiplexing servo tracking signals in a disk drive
A method, apparatus, and article of manufacture for controlling a disk drive with multiple VCMs is disclosed. The apparatus comprises a first disk storage surface and a second disk storage surface....
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6385000 |
System and method for extending the operating life of a magnetoresistive transducer provided in a disk drive system
An apparatus and method for extending the service life of an MR element incorporated in a read/write head involves detecting periods of disk drive system inactivity and selectively switching...
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6369971 |
PES linearization scheme for disk drive servo using small excitation bode measurements
A PES linearization scheme using small excitation bode measurements is provided to account for non-linearity characteristics during measurements of head element positions so to generate a more...
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6366423 |
Data storage medium having servo pattern of different phase and tracking method thereof
In a data storage medium, which includes a servo information area where information on the position of a head is recorded and a data information area where actual data information is recorded, the...
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6366419 |
Method of head disc assembly serial number encoding and retrieval and disc drive apparatus having an encoded head disc assembly serial number
Head disc assembly serial number information is encoded in the servo bursts recorded during servo track writing. Specifically, the HDA serial number information is written to the disc during disk...
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6351342 |
Disc drive servo system with dual head sampling
A servo system positions a transducer over a disc surface in a disc drive system. Disc surfaces in the drive each have a plurality of spaced servo samples recorded thereon. The servo samples on at...
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6347018 |
Digital servo control system for use in disk drives
A digital servo control system for disk drives is an “embedded” system—one in which servo control information is embedded on the same disk surface as the user data. In contrast to known...
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6345074 |
Maximum likelihood servo detector for detecting an error correcting servo code recorded on a disc storage medium
A disc storage system servo code detector is disclosed that provides enhanced error correction capabilities during both tracking and seeking by increasing a minimum distance d min between valid...
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6341048 |
Method and apparatus for servo data synchronization in a disc drive
A method and apparatus are provided for positioning a head based on a control signal and a cancellation signal. In the method and apparatus, a sensor located in the disc drive is capable of...
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6341045 |
Disk-shaped recording medium and formatting method thereof wherein historic information including a storage capacity of the disk-shaped recording medium is recorded thereon
In a large-capacity FD comprising a disk-shaped recording medium on which a plurality of tracks are arranged with concentric circles, each track is divided into a predetermined number of sectors...
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6337779 |
Disc-like recording medium, disc drive, and method for reading disc-like recording medium
In a servo area S A on a track that is empty of data and that lies outside a user data read/write area, to and from which a user data of a floppy disc is written and read, format information FI of...
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6337780 |
Servo burst signal recording method and disk recording medium
A servo burst signal recording method using an enhanced pattern and a disk recording medium are provided. The disk recording medium having at least two servo burst regions on which servo burst...
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6327105 |
Apparatus and methods for low overhead, highly reliable determination of position of a magnetic storage medium
A highly reliable, low overhead method for determining a position of a magnetic storage medium that is divided into a plurality of servo sections is provided. The inventive method includes defining...
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6327112 |
Adjacent track position detectable information storage apparatus
An information storage apparatus has a disk medium setting data recording areas along a plurality of tracks concentrically arranged, a head for recording and reproducing data on tracks of the disk...
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6324030 |
Digital pes demodulation for a disk drive servo control system using synchronous digital sampling
A digital servo system for a disk drive provides servo information signal demodulation. The system includes a digital demodulator including a burst signal accumulator that accumulates terms...
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6320711 |
High-speed unified data interface for a read channel in a disk drive system
The invention provides a high-speed interface that transfers user data and other data over a single unified interface between a read channel integrated circuit and another integrated circuit, such...
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6320718 |
Disk drive with zero read offset in reserved area and method of making same
A disk drive having a rotary actuator, an embedded servo system for controlling the rotary actuator, a rotating disk surface for recording and reproducing data, and a dual element head supported by...
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6313964 |
Early write enable with off-track write protection
In a disk drive system, a servo controller is operative to perform a process of inhibiting write operations for writing data to tracks of a disk during a head settling period following a track seek...
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6307704 |
Data recording medium and data recording/reproducing device with increased storage capacity
A recording disk has a data area and a servo-burst area alternately arranged with each other in the circumferential direction of the disk. The servo-burst area has a servo-burst pattern having...
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6304398 |
Dual modulo gray code positioning system
An apparatus and method of reducing the size of a servo burst and thus increasing the disc surface available for data storage is accomplished by uniquely encoding track information in the gray code...
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6295175 |
Apparatus for recognizing spin valve head failure due to pin layer magnetic field offset
When a pin layer magnetic field offset judgment unit judges that a magnetic field in a pin layer of a spin valve head through which a sense current flows in the interference direction has been...
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6292318 |
Disc recording/reproducing apparatus and medium having spiral data track
A data recording and/or reproducing apparatus which scans a head over a disc on which a servo pattern for moving the head to a predetermined position is recorded in an arc forming a part of a...
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6288861 |
Disk drive with sector numbers encoded by sequences of sector types
A magnetic recording disk drive has head positioning servo sectors with servo sector numbers (SSNs) that are not recorded on the disk. The SSNs are encoded through the use of multiple servo sector...
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6285521 |
Disk drive employing power source modulation for reducing power consumption
A disk drive includes a disk having data tracks including servo sectors and data regions disposed between the servo sectors. A transducer head writes data to and reads data from the data regions...
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6278568 |
Disk drive employing read channel IC with common port for data and servo
A disk drive includes a disk having a disk surface. The disk surface has a plurality of tracks arranged in an embedded servo format including servo track segments for storing servo data and data...
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6266205 |
Parallel servo with ultra high bandwidth off-track detection
A magnetic storage system having one or more rotating disks is disclosed. In a preferred embodiment, each rotating disk has two magnetic surfaces which each contain a number of tracks. Each track...
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6262857 |
Disk drive including a recording surface employing servo zones with banded data zones
A disk drive includes a disk having a disk surface, the disk surface having a plurality of tracks arranged in an embedded servo format. The disk surface includes a plurality of radially-extending...
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6262859 |
Method and apparatus for providing servo information on a disk in a hard drive assembly
The present invention is a method and apparatus for providing servo information on a disk in a hard disk drive. The hard disk drive has a disk with a plurality of tracks. Each of the plurality of...
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6262860 |
Magnetic disk apparatus with recessed tracking servo marks
A magnetic disk apparatus includes head bases placed one on another and supported for pivotal motion on a common pivot shaft, and sliders provided at free ends of the head bases and having magnetic...
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6256160 |
Programmable, variable data track pitch
A disk drive system having a disk used to store information is disclosed. In one embodiment, the disk includes a servo track having a servo track pitch and a data track having a data track pitch....
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6243224 |
Asynchronous digital demodulator and method for a null-type servo pattern
An asynchronous demodulator and method is provided which determines a position error of a read head relative to a position on a medium in a storage device. The read head generates a read signal as...
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6243223 |
Disk drive with servo burst phasing for improved linearity and off-track performance with a wide reading transducer
A disk drive has a sampled servo system controller and a disk with a plurality of angularly spaced servo wedges. Each of the servo wedges contains angularly aligned servo burst fields that are...
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6240238 |
Magnetic disk device
A magnetic disk device that has a sufficient tracking control capability and a sufficient capability, and has the rotational speed of a magnetic disk reduced to record moving-image information. A...
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6233106 |
Method of identifying a location on a recording medium encoded with local subtrack identifiers
A method of determining the subtrack within zone P on a recording medium is provided. The recording medium has a plurality of zones 1 through Q. Each zone has a plurality of subtracks 0 through M....
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6226142 |
Burst pattern for detecting the position of a read/write head relative to a magnetic disk
A technique for formatting a magnetic disk for a removable magnetic cartridge includes the steps of providing the magnetic disk having a top surface and a bottom surface, writing a first servo...
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6219197 |
Method and apparatus for servo positioning in a direct access storage device with a transducer read element width greater than 1/3 and less than 1/2 width of a data cylinder
A phase modulated servo method and apparatus provide acceptable position linearity for servo positioning with a narrow transducer head in a disk file. The disk file includes at least one disk...
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