Repeatable runout compensation using iterative learning control in a disc storage system
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United States of America Patent
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May 13, 2003
Grant Date -
N/A
app pub date -
Dec 29, 1999
filing date -
May 7, 1999
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A disc storage system is provided which includes a servo control loop for compensating for repeatable runout. Repeatable runout is compensated using table entries of the form Comp Value(k+1)=Comp Value(k)+K.PHI.(z)RRO(k), where K is a learning rate; k is iteration number .PHI.(z) is a filter and RRO(k) is the repeatable runout error. Further, .rho.(j.omega.)=.vertline.1-K.PHI.(j.omega.)/(1+PC(j.omega.).vertline.<1 needs to be satisfied, where PC(j.omega.) is an open loop frequency response of the servo loop. The filter can comprise a order filter.
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