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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
6762895 Magnetic disk drive and position error signal generation method Jul. 13, 2004
6762644 Apparatus and method for a nested transimpedance amplifier Jul. 13, 2004
6757126 Magnetic recording medium having tracking control area formed adjacent data tracks Jun. 29, 2004
6757129 Magnetic disk storage apparatus Jun. 29, 2004
6757127 Adaptive temperature compensated AC unlatch algorithm Jun. 29, 2004
6754031 Method and apparatus for controlling an access mechanism within a disk drive Jun. 22, 2004
6754030 Optimal reader-to-writer offset measurement of a head in a disc drive for reduced track misregistration Jun. 22, 2004
6751043 Digital servo control system for a hard disc drive using a voice coil motor in voltage mode Jun. 15, 2004
6751042 Track pitch correction method and apparatus Jun. 15, 2004
6747837 Disk drive comprising an integrator for controlling a VCM actuator and transformer for controlling a piezoelectric actuator Jun. 8, 2004
6747833 Magnetic disk drive with a head oscillation function and the control method thereof Jun. 8, 2004
6747836 Position control system and method for magnetic hard disk drive systems with dual stage actuation Jun. 8, 2004
6744589 Single-sided unipolar device driver for a piezoelectric transducer in a disc drive Jun. 1, 2004
6738218 Disk storage device and head positioning method May. 18, 2004
6735033 Method for recovering from shock events occurring to a disk drive during data write operations to improve data reliability May. 11, 2004
6724563 Two-stage actuator with sensitivity function preventing disturbances at all frequencies Apr. 20, 2004
6724561 Apparatus and method for compensating for environmental effects on media Apr. 20, 2004
6724560 Head assembly employing microactuator in recording medium drive Apr. 20, 2004
6721122 Disk drive unit and control method for same Apr. 13, 2004
6721121 In-situ determination of landing zone transition for improved disk drive reliability Apr. 13, 2004
6717761 Recording/reproducing apparatus Apr. 6, 2004
6710965 Phase-advanced filter for robust resonance cancellation Mar. 23, 2004
6710966 Method for reducing an effect of vibration on a disk drive during a track following operation by adjusting an adaptive-filter gain applied to an acceleration sensor signal Mar. 23, 2004
6707633 Magnetic disk device including coarse and micro actuators Mar. 16, 2004
6707635 Method and apparatus for RRO learning on alternate tracks before and after shipping to cancel RRO in a disk drive Mar. 16, 2004
6690537 Method and system for controlling the positioning of a read/write head of a data recording device Feb. 10, 2004
6690534 Method and apparatus for handling multiple resonance frequencies in disc drives using active damping Feb. 10, 2004
6683737 Method and apparatus for predictive failure analysis technique for head crashes in hard drives using position error signal Jan. 27, 2004
6671790 Optimizing reader to writer offset compensation for a disc drive Dec. 30, 2003
6667840 Method for screening oscillatory PES with 1.7 kHz harmonic resonance Dec. 23, 2003
6665138 Technique for detecting head position in hard disk drive Dec. 16, 2003
6661359 Device and method for generating synchronous numeric signals Dec. 9, 2003
6657805 Method of controlling read write operation of a magnetic disk apparatus Dec. 2, 2003
6657801 Disk drive with improved characterization segment pattern and method of recording the same Dec. 2, 2003
6654195 Disk drive having a register set for providing real time position variables to a host Nov. 25, 2003
6650491 System and method for setting a read/write offset and for recovering from data read errors Nov. 18, 2003
6646823 Disk drive using offset data sectors Nov. 11, 2003
6646824 Head-positioning control method and device for a disk device Nov. 11, 2003
6643084 Adaptive off-track recovery Nov. 4, 2003
6636376 Disc drive resonance disturbance cancellation filter Oct. 21, 2003
6636375 Seek in a disc drive with nonlinear pivot friction Oct. 21, 2003
6628471 Detection and cancellation of cage frequency using the clock head in a servowriter Sep. 30, 2003
6618220 Head actuator and hard disc drive including the same Sep. 9, 2003
6614614 Method and apparatus for writing servo pattern Sep. 2, 2003
6614609 Gray code detection for a disk drive system Sep. 2, 2003
6608731 Dynamic reduction of track shape errors in disc drives Aug. 19, 2003
6606213 Actuator resonance screening in disc drives Aug. 12, 2003
6606214 System and method to minimize bearing pivot effect in disc drive actuator Aug. 12, 2003
6600635 Combined magnetic data and burnish head for magnetic recording Jul. 29, 2003
6580579 Disturbance rejection for disc drives using adaptive accelerometer feedforward servo Jun. 17, 2003

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