Patent ID: 6449116
Filing Date: 2002-09-10
Classification: G11B

Abstract:
A method of compensating for repeatable run-out errors in a disc drive, the method comprising:(a) determining transfer function values for a servo loop in the disc drive; (b) determining a sequence of repeatable run-out values for a portion of the disc drive; (c) applying a transform to the sequence of repeatable run-out values to obtain frequency-domain repeatable run-out values; (d) dividing each frequency-domain repeatable run-out value by a respective transfer function value to produce frequency-domain compensation values; (e) storing the frequency-domain compensation values produced in step (d); (f) applying an inverse transform to the frequency-domain compensation values to obtain a sequence of time-domain compensation values; and (g) injecting the sequence of time-domain compensation values into the servo loop.