Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1997-07-29
1999-07-27
Huber, Paul W.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 7707, G11B 5596
Patent
active
059300671
ABSTRACT:
An adaptive servo system for a disk drive compensates for a track being off center or distorted by analyzing the spectral content of the radial variation of the centerline of a track relative to a rotation axis, generating multiple component signals having frequencies that are harmonics of the rotation frequency, and combining the component signals in a positioning signal for an actuator. Analyzing the spectral content of the radial variation can be accomplished by a discrete Fourier transform of a position error signal while generating a correction signal that cancels all or part of previously determined components of the position error signal. The system converges to generating a periodic signal that compensates for multiple harmonics in the radial variation in the position of the track.
REFERENCES:
patent: 4831315 (1989-05-01), Hammond et al.
patent: 4974109 (1990-11-01), Hoshimi et al.
patent: 5539714 (1996-07-01), Andrews, Jr. et al.
Alt Robert A.
Andrews Thomas L.
Counts Gary E.
Loomis Ronald J.
Mertens Steven J.
Huber Paul W.
Mobile Storage Technology Inc.
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