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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
6989949 Performance test method of head gimgal assembly with precise positioning actuator Jan. 24, 2006
6987629 Rangeless servo notch optimization Jan. 17, 2006
6985543 Digital servo channel for recording apparatus Jan. 10, 2006
6982848 Disk apparatus and head positioning method Jan. 3, 2006
6977790 Design scheme to increase the gain of strain based sensors in hard disk drive actuators Dec. 20, 2005
6977788 Method and apparatus for adjusting angular position of magnetic head unit Dec. 20, 2005
6975479 Magnetic disc storage apparatus Dec. 13, 2005
6975471 Data recording medium with servo pattern having pseudo-random binary sequences Dec. 13, 2005
6965547 Tracking and focus servo system with error signal inverse non-linearity calibration Nov. 15, 2005
6961202 Data storage device having acceleration sensor attached to circuit board for detecting vibrations in planar rotation direction along circuit board Nov. 1, 2005
6954318 Magnetic data embedding apparatus having checking function Oct. 11, 2005
6943969 Method of detecting protrusion on recording medium and detecting apparatus therefor Sep. 13, 2005
6937422 Self-monitoring and self-healing of frequency specific position errors in a data storage device Aug. 30, 2005
6937423 Reducing effects of rotational vibration in disk drive Aug. 30, 2005
6937421 Patterned media having offset tracks Aug. 30, 2005
6937430 Robust triple-mode compensator for hard disk drives with dynamic friction Aug. 30, 2005
6922301 Positioner of a disk drive that positions a data transducer with reduced vibration Jul. 26, 2005
6922303 Reaction mass dual-stage actuator (DSA) and sensor Jul. 26, 2005
6917483 Non-consecutive transitional mechanism for seek operations when transitioning from a seek control to a track following control Jul. 12, 2005
6914743 Vibration cancellation in a disk drive by using an acceleration sensor and adaptively adjusting its gain to minimize external acceleration effects Jul. 5, 2005
6906485 Spindle motor control using a current profile to taper current transitions Jun. 14, 2005
6903897 Performance of a rotary actuator in a disk drive Jun. 7, 2005
6903894 Magnetic disc storage apparatus Jun. 7, 2005
6903896 Head positioning method, and disk apparatus using the same Jun. 7, 2005
6900958 Method and disk drive for improving head position accuracy during track following through real-time identification of external vibration and monitoring of write-unsafe occurrences May. 31, 2005
6898046 Method and system for rotational velocity-based algorithm for vibration compensation in disk drives May. 24, 2005
6891692 Disk drive apparatus, head position control method, and hard disk drive May. 10, 2005
6891694 Method for writing streaming audiovisual data to a disk drive May. 10, 2005
6888696 Magnetic disk apparatus and servo signal recording method May. 3, 2005
6876511 Disk drive and method of detecting servo address mark in the same Apr. 5, 2005
6868477 Method and apparatus for optimizing skip mask operations in a disc drive Mar. 15, 2005
6864656 Magnetic disk drive and voice coil motor drive circuit Mar. 8, 2005
6862155 Squeeze evaluations that account for low frequency components, in a controller usable in a data handling system Mar. 1, 2005
6856483 Device and method for generating synchronous numeric signals with phase-delay minimization in control systems with open-loop compensation Feb. 15, 2005
6853511 Average position error measurement in a data storage device Feb. 8, 2005
6853512 Data storage device, head positioning apparatus and head positioning method Feb. 8, 2005
6847504 Split VCM actuator Jan. 25, 2005
6836182 Nested transimpedance amplifier Dec. 28, 2004
6826006 Method for recursively determining repeatable runout cancellation values in a magnetic disk drive Nov. 30, 2004
6819519 Head position control method for a disk device and the disk device Nov. 16, 2004
6813111 Implementation method of digital phase-locked loop Nov. 2, 2004
6801377 Performance test method of head gimbal assembly with precise positioning actuator Oct. 5, 2004
6795262 Method of modifying on-track declaration algorithm of a disk drive based upon detection of external vibration condition Sep. 21, 2004
6795265 Closed loop charge mode drive for piezo actuators using a DC restore amplifier Sep. 21, 2004
6785083 Application of reduced bias levels to disc drive read elements during periods of inactivity Aug. 31, 2004
6775090 Adapting logical track addresses in relation to head offsets Aug. 10, 2004
6768614 Positioner for precisely moving an e-block of a disk drive Jul. 27, 2004
6768609 Reducing position error signal nonlinearity through iterative calibration of a compensation table Jul. 27, 2004
6768607 Adaptive dual-frequency notch filter Jul. 27, 2004
6765749 Frequency attenuating filter apparatus and method for a data storage device Jul. 20, 2004

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