Disk drive applying feed-forward compensation when writing consecutive data tracks

摘要

A disk drive is disclosed comprising a disk comprising a plurality of servo tracks defined by servo sectors, a head actuated over the disk, and control circuitry comprising a servo control system operable to servo the head over the disk. A plurality of data tracks are defined relative to the servo tracks, and a first data track is accessed while servoing the head over the first data track based on a position error signal Xn−1(k) generated at each servo sector of the first data track. Feed-forward compensation values are generated based on Xn−1(k), and a second, consecutive data track is accessed while servoing the head over the second data track based on a position error signal Xn(k) generated at each servo sector of the second data track and based on the feed-forward compensation values.

主权项

1. A disk drive comprising:
a disk comprising a plurality of servo tracks defined by servo sectors; a head actuated over the disk; and control circuitry comprising a servo control system operable to servo the head over the disk, the control circuitry operable to:
define a plurality of data tracks relative to the servo tracks, wherein each data track comprises a plurality of data sectors;access a first data track while servoing the head over the first data track based on a position error signal Xn−1(k) generated at each servo sector of the first data track;generate first feed-forward compensation values based on Xn−1(k); andaccess a second data track while servoing the head over the second data track based on a position error signal Xn(k) generated at each servo sector of the second data track and based on the first feed-forward compensation values,wherein:the second data track is consecutive with the first data track;the access of the first data track accesses at least one data sector in the first data track; andthe access of the second data track accesses at least one data sector in the second data track.