Adaptive Feed Forward Rotational Vibration Compensation During a SEEK Operation
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United States of America Patent
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Issued Date -
Apr 1, 2010
app pub date -
Sep 29, 2008
filing date -
Sep 29, 2008
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A disk drive assembly includes a disk drive, one or more accelerometers, a control circuit, and an adaptive feed forward circuit. The one or more accelerometers generate acceleration signals that are used to detect rotational vibration (RV) events on the disk drive. The control circuit is configured to: generate one or more control signals, which are based on a control signal from a host system and a compensation signal from the adaptive feed forward circuit, and generate a position error signal (PES) that indicates an error in a position of a disk drive head relative to a center of a track. The adaptive feed forward circuit generates the compensation signal, which compensates for the detected RV events based on the acceleration signals and the PES. The compensation signal accounts for self-induced RV events generated by a SEEK operation that repositions the head to a new track, wherein feed forward adaption is not disturbed by the SEEK operation.
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