Disk drive estimating a sinusoidal error in a wedge time...

Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data clocking

Reexamination Certificate

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C360S025000

Reexamination Certificate

active

07068451

ABSTRACT:
A disk drive and method for estimating a sinusoidal error in a wedge time period is disclosed. An estimated WTP is calculated according to:in-line-formulae description="In-line Formulae" end="lead"?EST_WTP=RTP+â*cos(2πk/N)+{circumflex over (b)}*sin(2πk/N)in-line-formulae description="In-line Formulae" end="tail"?wherein RTP is a reference time period corresponding to a nominal WTP, k is an index representing a servo wedge, and {â,{circumflex over (b)}} are adjustable coefficients. A wedge time error e(k) is estimated as the difference between the estimated WTP and a detected actual WTP. The coefficients {â,{circumflex over (b)}} for generating the estimated WTP are adjusted according to:in-line-formulae description="In-line Formulae" end="lead"?â(k+1)=â(k)−G*e(k)*cos(2πk/N)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?{circumflex over (b)}(k+1)={circumflex over (b)}(k)−G*e(k)*sin(2πk/N)in-line-formulae description="In-line Formulae" end="tail"?wherein G is a predetermined gain.

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