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

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

2006-06-27

2006-06-27

Young, Wayne (Department: 2627)

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data clocking

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.

REFERENCES:
patent: 5297131 (1994-03-01), Tanaka
patent: 5761165 (1998-06-01), Takeda et al.
patent: 5905705 (1999-05-01), Takeda et al.
patent: 6067202 (2000-05-01), Rowan et al.
patent: 6285622 (2001-09-01), Haraguchi et al.
patent: 6381292 (2002-04-01), Yamakoshi
patent: 6498698 (2002-12-01), Golowka et al.
patent: 6710957 (2004-03-01), Nakasato
patent: 6754025 (2004-06-01), Shepherd et al.
patent: 6882487 (2005-04-01), Hanson et al.
patent: 6882609 (2005-04-01), Williams et al.
patent: 6954324 (2005-10-01), Tu et al.
patent: 6972540 (2005-12-01), Wang et al.
patent: 2001/0013989 (2001-08-01), Saiki et al.
patent: 2002/0078413 (2002-06-01), Haines et al.
patent: 2002/0084760 (2002-07-01), Messenger et al.
patent: 2003/0184906 (2003-10-01), Hanson et al.
patent: 2004/0245950 (2004-12-01), Ang et al.
patent: 2005/0105205 (2005-05-01), Suzuki
A. Sacks, M. Bodson, W. Messner, “Advanced Methods for Repeatable Runout Compensation”, IEEE Transactions on Magnetics, vol. 31, No. 2, Mar. 1995.

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