Virtual tracks for repeatable runout compensation
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United States of America Patent
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Oct 4, 2005
Grant Date -
N/A
app pub date -
Dec 8, 2000
filing date -
Dec 16, 1999
priority date (Note) -
In Force
status (Latency Note)
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Abstract
The present invention relates to repeatable runout (RRO) compensation of servo control systems that can be used in disc drives or spin-stands. The RRO relates to eccentricity between servo tracks, which were written onto a disc prior to the installation of the disc into the disc drive or spin-stand, and an axis of rotation of the disc. The present invention compensates the servo control loop by canceling the RRO and controlling a head to follow virtual tracks which are eccentric to the data tracks defined by the servo tracks and concentric with the axis of rotation of the disc.
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