Patent ID: 6654198
Filing Date: 2003-11-25
Classification: G11B

Abstract:
A method of isolating repeatable and non-repeatable error components of a total written-in repeatable run-out error of a data track of a rotatable disc surface of a disc drive for use in compensating shape irregularity of the data track comprising steps of:(a) determining the total written-in repeatable run-out error value component for a selected servo sector of a plurality of servo sectors of the data track; (b) isolating the repeatable error value component of the selected servo sector for use in determining the non-repeatable error value component; (c) separating the repeatable error value component from the total written-in repeatable run-out error value, to determine the non-repeatable error value component for the selected servo sector; (d) providing both the repeatable and non-repeatable error value components to a processor for generation of compensation signals used in compensating the total written-in repeatable run-out error value for the selected servo sector; and (e) compensating the shape irregularity of the data track by repeating steps (a) through (d) for each of the plurality of servo sectors of the data track of the disc drive and applying the compensation signals into a servo loop of the disc drive.