Disk drive adjusting write clock frequency to compensate for...

Details Disk drive adjusting write clock frequency to compensate for... Disk drive adjusting write clock frequency to compensate for...

2007-07-31

2007-07-31

Wong, K. (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S051000

Reexamination Certificate

active

10992930

ABSTRACT:
A disk drive is disclosed that estimates a sinusoidal error in a wedge time period due to eccentricity in the disk rotating to generate eccentricity compensation values. During a write operation a head is positioned over a target data sector within a target track, a write clock frequency is set using an eccentricity compensation value corresponding to the target data sector, and data is written to the target data sector using the write clock frequency. In this manner, the eccentricity compensation value adjusts the write clock frequency to better optimize the linear bit density from the inner to outer diameter tracks.

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: 6141175 (2000-10-01), Nazarian et al.
patent: 6285521 (2001-09-01), Hussein
patent: 6285622 (2001-09-01), Haraguchi et al.
patent: 6377418 (2002-04-01), Kagami et al.
patent: 6381292 (2002-04-01), Yamakoshi
patent: 6496324 (2002-12-01), Golowka et al.
patent: 6498698 (2002-12-01), Golowka et al.
patent: 6567230 (2003-05-01), Kagami et al.
patent: 6577088 (2003-06-01), Heydt et al.
patent: 6621652 (2003-09-01), Haines et al.
patent: 6710957 (2004-03-01), Nakasato
patent: 6738205 (2004-05-01), Moran et al.
patent: 6754025 (2004-06-01), Shepherd et al.
patent: 6825622 (2004-11-01), Ryan 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: 7068451 (2006-06-01), Wang et al.
patent: 2001/0013989 (2001-08-01), Saiki et al.
patent: 2002/0036859 (2002-03-01), Liu et al.
patent: 2002/0078413 (2002-06-01), Haines et al.
patent: 2002/0084760 (2002-07-01), Messenger et al.
patent: 2003/0048083 (2003-03-01), Tieu
patent: 2003/0085682 (2003-05-01), Hussein
patent: 2003/0102834 (2003-06-01), Hussein
patent: 2003/0184906 (2003-10-01), Hanson et al.
patent: 2004/0036436 (2004-02-01), Tieu
patent: 2004/0125485 (2004-07-01), Ehrlich
patent: 2004/0245950 (2004-12-01), Ang et al.
patent: 2005/0063087 (2005-03-01), Ehrlich
patent: 2005/0063088 (2005-03-01), Ehrlich
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.

Affiliated with

Also associated with

Rating

Disk drive adjusting write clock frequency to compensate for... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Disk drive adjusting write clock frequency to compensate for..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Disk drive adjusting write clock frequency to compensate for... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3720570