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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
6577464 Magnetic recording device having first actuator for coarse adjustment and second actuator for fine adjustment Jun. 10, 2003
6570732 Method and apparatus for settling determination control systems May. 27, 2003
6560055 ID-less format defect management for automatic track processing including translation of physical sector number into logical sector number May. 6, 2003
6556370 Method of writing tracking servo signal pattern for magnetic disk device Apr. 29, 2003
6549349 Adaptive vibration control for servo systems in data storage devices Apr. 15, 2003
6545835 Method and apparatus for RRO learning before and after shipping to cancel RRO in a disk drive Apr. 8, 2003
6538839 Disk drive employing adaptive feed-forward vibration compensation to enhance a retry operation Mar. 25, 2003
6538836 Microactuator for fine positioning in a disc drive Mar. 25, 2003
6535347 Head controlling device in a disk apparatus Mar. 18, 2003
6532129 Method and apparatus for sustaining feedback filter state having periodic output Mar. 11, 2003
6532130 Head for reading magnetically stored data Mar. 11, 2003
6515818 Track follow at quarter track with narrow heads using non-conventional ordering of quadrature fields Feb. 4, 2003
6510016 Head positioning control system for disk drive Jan. 21, 2003
6507449 Digital servo demodulator with synchronous dithering and method Jan. 14, 2003
6498694 Servo error integration in read-channel equalization Dec. 24, 2002
6498693 Method and system for MR offset calibration Dec. 24, 2002
6496321 Magnetic recording/reproducing device using composite head Dec. 17, 2002
6493172 Disturbance rejection of mechanical interaction for dual-actuator disc drives using adaptive feedforward servo Dec. 10, 2002
6490118 Adaptive h-infinity hardware controller for disc drive actuator control Dec. 3, 2002
6469861 Head positioning apparatus and method therefor Oct. 22, 2002
6469862 Method and apparatus for improved servo signal filtering in read channels Oct. 22, 2002
6466394 Storage device and method of detecting a position of a head on a disk of the storage device Oct. 15, 2002
6456450 Method and apparatus for reducing track misregistration due to digital-to-analog converter quantization noise Sep. 24, 2002
6445540 Linear air bearing with vacuum stiffener Sep. 3, 2002
6445522 Disk device and method of generating signal representing head Sep. 3, 2002
6437935 Method and apparatus for a real and positional optimization of a storage disk data zone Aug. 20, 2002
6433950 Disk drive with radially dispersed servo bursts Aug. 13, 2002
6429994 Method and apparatus for providing servo gain linearization for a magneto-resistive head Aug. 6, 2002
6421197 Optimal reader/writer offsets and write fault thresholds in a disc drive Jul. 16, 2002
6417982 System and method for identifying and filtering a head suspension assembly resonance frequency Jul. 9, 2002
6414813 Rotational acceleration correction in a disc drive Jul. 2, 2002
6407876 Magnetic disk apparatus having an accelerometer for detecting acceleration in the positioning direction of the magnetic head Jun. 18, 2002
6407878 Horizontal loader for high density servo track writing Jun. 18, 2002
6407877 Recording/reproducing method and apparatus in which head driver is unlocked when medium is loaded and when track position information formulation based on optical signal input has been complet Jun. 18, 2002
6404570 Disk drive with adaptive channel optimization Jun. 11, 2002
6396654 Embedded servo writing method and apparatus for hard disk drive May. 28, 2002
6388833 Method for manufacturing a disk drive having an overwriteable clock track May. 14, 2002
6377416 A/D with digital PLL Apr. 23, 2002
6366423 Data storage medium having servo pattern of different phase and tracking method thereof Apr. 2, 2002
6335845 Magnetic disk apparatus having an accelerometer for detecting acceleration in the positioning direction of the magnetic head Jan. 1, 2002
6327111 System for reducing controller delays during sequential data transfers in a disc drive Dec. 4, 2001
6324030 Digital pes demodulation for a disk drive servo control system using synchronous digital sampling Nov. 27, 2001
6310741 Magnetic disk apparatus with data track reassigning function Oct. 30, 2001
6304408 Apparatus and method for a reduced seek-to-track time fuzzy rule controller for a hard disk drive read/write head actuator Oct. 16, 2001
6292318 Disc recording/reproducing apparatus and medium having spiral data track Sep. 18, 2001
6266205 Parallel servo with ultra high bandwidth off-track detection Jul. 24, 2001
6259576 Method and apparatus for hard disk drive with self-servowriting capability Jul. 10, 2001
6243223 Disk drive with servo burst phasing for improved linearity and off-track performance with a wide reading transducer Jun. 5, 2001
6243226 Apparatus and method for digital servocontrol in a data storage system using disk recording media Jun. 5, 2001
6240238 Magnetic disk device May. 29, 2001

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