FEED-FORWARD METHOD FOR REPEATABLE RUNOUT CANCELLATION
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United States of America Patent
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-
Aug 31, 2010
Grant Date -
Sep 23, 2010
app pub date -
Mar 17, 2009
filing date -
Mar 17, 2009
priority date (Note) -
Granted
status (Latency Note)
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Abstract
A magnetic hard disk drive includes a method for eliminating that portion of track following error by a read/write transducer that is caused by repeatable runout of the disk tracks. The repeatable runout is eliminated by application of an iterative algorithm that calculates feed-forward correction terms based on gain coefficients iteratively calculated from the amplitude and phase portions of a Bode plot characterizing the system. The corrective coefficients can be inserted into the hard disk drive at a summing junction that redefines the centerline of the track, or at a summing junction that causes the actuator to follow the repeatable runout and make non-repeatable runout corrections relative thereto.
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