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Class Information
Number: 360/77.02
Name: Dynamic magnetic information storage or retrieval > Automatic control of a recorder mechanism > Controlling the head > Track centering > Rotary carrier
Description: Subject matter which controls a transducer centering position relative to a circular revolving medium.

Sub-classes under this class:

Class Number Class Name Patents
360/77.04 By memory storage of repeatable error or correction 625
360/77.03 By nonmagnetic sensing (e.g., optical, capacitive) 253
360/77.05 By servo signal component from carrier surface separate from information signal bearing surface 199
360/77.07 By tracking signal recorded on or immediately beneath surface 234
360/77.06 Reproduced data signal used for tracking 198

Patents under this class:
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Patent Number Title Of Patent Date Issued
5870241 Method and apparatus for evasive maneuvering to keep DASD heads away from protruding surface defects Feb. 9, 1999
5867341 Disc drive system using multiple pairs of embedded servo bursts Feb. 2, 1999
5859740 Information storage disc and information recording and reproducing apparatus Jan. 12, 1999
5854715 Method for tracking a read head on a data area on a disk and disk apparatus using the method Dec. 29, 1998
5848438 Memory mapping defect management technique for automatic track processing without ID field Dec. 8, 1998
5825582 Sliding mode control of a disk drive actuator for positioning a read/write head over a selected track during seeking and tracking operations Oct. 20, 1998
5825580 Data recording/reproducing device and burst position conversion coefficient setting method in the same Oct. 20, 1998
5825579 Disk drive servo sensing gain normalization and linearization Oct. 20, 1998
5822147 Position control apparatus and method with a digital filter and a phase change filter section in a disk storage device Oct. 13, 1998
5818651 Motor control device for information recording and reproducing apparatus Oct. 6, 1998
5801896 Method and apparatus for servo pulse detection with high AC coupling and large pulse asymmetry Sep. 1, 1998
5801311 Rotary drive accelerator Sep. 1, 1998
5796542 Servo-track writer system having a plurality of engaging pins co-axially rotated with head actuator pivot axes Aug. 18, 1998
5796544 Disk drive system which uses a common DAC for digital positioning control and analog positioning control Aug. 18, 1998
5781365 Sliding mode control of a magnetoresistive read head for magnetic recording Jul. 14, 1998
5781360 Method and apparatus for detecting data track misregistration Jul. 14, 1998
5774299 Adaptive calibration of read/write elements in a disc drive Jun. 30, 1998
5760990 Servo position error signal calibration in a hard disc drive Jun. 2, 1998
5754354 Magnetic disk drive unit with complex magnetic head of variable reading width May. 19, 1998
5748400 Method of compensating for the misregistration of the radial track positions of a floppy diskette in a disk drive May. 5, 1998
5731723 Half symbol delay calibration for phase window centering Mar. 24, 1998
5717538 Asynchronous position error signal detector employing weighted accumulation for use in servo system Feb. 10, 1998
5708581 Method for maximizing feedforward orthogonality for minimizing servo system nuller instability Jan. 13, 1998
5663847 Rejection of disturbances on a disk drive by use of an accelerometer Sep. 2, 1997
5625508 Method and apparatus for servo demodulation in a direct access storage device Apr. 29, 1997
5617267 Servo data writing apparatus for supporting the free end of a rotating shaft in a magnetic disk device and method of writing servo data Apr. 1, 1997
5610777 Method and apparatus for writing servo tracks of a magnetic disk unit which uses a probe to control the positioning of the head Mar. 11, 1997
5602691 Magnetic disk drive apparatus using contact start/stop mode and head load/unload mode Feb. 11, 1997
5602692 Sampled position error signal demodulation system for banded data disk drives Feb. 11, 1997
5602693 Method and apparatus for sensing position in a disk drive Feb. 11, 1997
5570244 Method and apparatus for controlling assertion of a write inhibit signal using separate threshold values for each of a plurality of recording surfaces Oct. 29, 1996
5550447 Pulse generating system responding to instruction pulses for generating driving pulses for diving motor Aug. 27, 1996
5548454 Information recording disk, its production method and recording apparatus Aug. 20, 1996
5537282 Data storage disk having improved tracking capability Jul. 16, 1996
5521891 Speed detection apparatus, speed control motor, and track jump control circuit May. 28, 1996
5517371 Track sector detection system for rotating disk data storage apparatus May. 14, 1996
5517631 Miniature disk drive having embedded sector servo with split data fields and automatic on-the-fly data block sequencing May. 14, 1996
5483393 Disk drive having head positioning servo with improved servo read signal processing using median servo burst peak magnitudes Jan. 9, 1996
5475544 Head positioning control device for a magnetic disk apparatus Dec. 12, 1995
5459624 Activator control method and apparatus for positioning a transducer using a phase plane trajectory trough function for a direct access storage device with estimated velocity and position state Oct. 17, 1995
5455720 Offset and gain error discriminator Oct. 3, 1995
5450249 Demodulator circuit Sep. 12, 1995
5442498 Asynchronous track code encodement and detection for disk drive servo control system Aug. 15, 1995
5434725 Magnetic disc driving device for controlling the position of a magnetic head relative to the disc Jul. 18, 1995
5432659 Magnetic disk unit having a plurality of magnetic heads Jul. 11, 1995
5424885 Method for following data tracks in a disc drive using an improved thermal calibration method Jun. 13, 1995
5416652 Apparatus for, and methods of, recording signals in tracks on a memory member without a reference index May. 16, 1995
5412640 Method for measuring and regulating the radial and tangential angles of a light beam May. 2, 1995
5408367 Method of optimizing operation of disk drive Apr. 18, 1995
5402278 Method for recording a positioning signal on a magnetic recording disk and apparatus for recording the same Mar. 28, 1995

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