Tien Bich Le

US Patent:

7558016, Jul 7, 2009

Filed:

Apr 20, 2007

Appl. No.:

11/788641

Inventors:

Tien Quang Le - Tustin CA, US
Duc T. Phan - Saratoga CA, US

Assignee:

Western Digital Technologies, Inc. - Lake Forest CA

International Classification:

G11B 21/02

US Classification:

360 75

Abstract:

A disk drive comprising a moveable head, a disk, and a servo controller to control track following operations including implementing an estimation filter is disclosed. The disk includes a plurality of tracks in which a substantial majority of the tracks include a plurality of servo sectors utilized in track following operations. The servo controller implements an estimation filter and performs operations that include: determining a current position estimate of the moveable head relative to the track; predicting a subsequent position estimate of the moveable head relative to the track based upon the current position estimate; and determining whether the predicted subsequent position exceeds an error threshold.