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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:
1 2 3 4 5 6 7 8 9 10 11 12 13 14

Patent Number Title Of Patent Date Issued
6239932 Method of and arrangement for formatting a magnetizable medium May. 29, 2001
6222691 Interleaved dibit detection for direct access storage device (DASD) Apr. 24, 2001
6212023 Quickly written servo-patterns for magnetic media including depositing after writing Apr. 3, 2001
6204990 Circuit and method for determining the position of a read head for a magnetic disk drive device Mar. 20, 2001
6201659 Cartridge-loading apparatus with tilting bias coil assembly Mar. 13, 2001
6198591 Multi-task operating system for a disc drive Mar. 6, 2001
6181504 Method for measuring track pitches of a hard disk drive Jan. 30, 2001
6178058 Off-track write protection method and system for induced mechanical disturbance on a disk drive Jan. 23, 2001
6175465 Head positioning control system for use in a disk storage drive Jan. 16, 2001
6163425 Magnetic reproduction apparatus having MR head in which electromigration occurring in MR head is suppressed Dec. 19, 2000
6157511 Disk drive with variable-phase servo burst patterns Dec. 5, 2000
6153997 Disk apparatus and method of controlling disk apparatus Nov. 28, 2000
6130791 Magnetic disk drive having read channel in which low-frequency cutoff is set relatively high to cope with thermal asperity Oct. 10, 2000
6125154 Digital servo channel for recording apparatus Sep. 26, 2000
6122117 Method for digitally demodulating position signals recorded on recording media Sep. 19, 2000
6122131 Adaptively-controlled disk drive assembly Sep. 19, 2000
6118615 Apparatus for positioning head of magnetic storage device Sep. 12, 2000
6097559 System and method for detecting head-to-disk contact in-situ a direct access storage device using a position error signal Aug. 1, 2000
6079043 Magnetic disk apparatus Jun. 20, 2000
6067204 Disc drive servo pattern insensitive to read head May. 23, 2000
6067206 Method and apparatus to compensate for servo wedge rotational offset after a head switch May. 23, 2000
6064542 Methods and apparatus for positioning read/write head in a computer disk drive May. 16, 2000
6046878 Object positioning using discrete sliding mode control with variable parameters Apr. 4, 2000
6043952 Method of positioning a head in a disk drive using groups of servo bursts Mar. 28, 2000
6028731 Method and system for providing servo signals to a magnetic head positioning system of disk drive Feb. 22, 2000
6025966 Defect management for automatic track processing without ID field Feb. 15, 2000
6025970 Digital demodulation of a complementary two-frequency servo PES pattern Feb. 15, 2000
6014283 Non-quadrature servo burst pattern for micro-jogging a magnetoresistive head in a magnetic disk drive Jan. 11, 2000
6005740 Method and apparatus for developing position error curves for magneto-resistive heads Dec. 21, 1999
6005739 Technique for controlling the position error signal of a disk drive Dec. 21, 1999
6002541 Method and apparatus for providing a linear position error sensing (PES) signal Dec. 14, 1999
6002542 Magnetic disc read head positioning device and method Dec. 14, 1999
5999351 Multi-track density direct access storage device Dec. 7, 1999
5998994 MR head offset correction method and magnetic disk certifier Dec. 7, 1999
5999360 Disc drive servo system employing thermal signals Dec. 7, 1999
5995317 Method and apparatus for real-time filtering of a position error signal for a disk drive servo system Nov. 30, 1999
5995305 Disk drive using off-track margin to obtain optimal performance parameters Nov. 30, 1999
5953178 Magnetic disk apparatus Sep. 14, 1999
5949603 Self servo writing file using the widest head Sep. 7, 1999
5940239 Velocity/position estimator of magnetic head in magnetic disk driving apparatus Aug. 17, 1999
5940240 Constant velocity servo linearity calibration method for MR head Aug. 17, 1999
5930066 Information recording apparatus Jul. 27, 1999
5909336 Position detection scheme for headerless disk controller Jun. 1, 1999
5903408 Data recording/reproducing apparatus having track interference reduction mechanism May. 11, 1999
5898535 Method and apparatus for recording and reproducing data in and from a data sector even when thermal asperity occurs in the servo area Apr. 27, 1999
5894375 Magnetic disk apparatus and method that reverses sense current in magnetoresistive head Apr. 13, 1999
5892635 Servo writer for magnetic disk drive and servo writing method Apr. 6, 1999
5880953 Control system and information recording and reproducing apparatus Mar. 9, 1999
5877914 Amplifier output clamping scheme Mar. 2, 1999
5872669 Disk drive apparatus with power conservation capability Feb. 16, 1999

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