Compensation for repeatable runout error
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United States of America Patent
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-
Aug 12, 2003
Grant Date -
N/A
app pub date -
Aug 9, 1999
filing date -
Feb 22, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A disc drive having a servo loop for positioning a head over a disc includes a servo controller which generates a servo control signal in response to a received position error signal. An actuator, coupled to the servo controller, moves the head in response to the servo control signal. A sensor, located in the head, senses servo information located on the disc and produces a servo signal therefrom. The servo signal is combined with a reference signal to produce the position error signal. A compensation storage device stores decimated compensation values and a servo compensator expands the decimated compensated values and injects the expanded compensation values into the servo loop.
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