Patent ID: 6496320
Filing Date: 2002-12-17
Classification: G11B

Abstract:
In a disc drive having a rotatable disc with a recording surface on which a plurality of concentric data tracks are defined, a controllably positionable head adjacent the recording surface, and a servo circuit which generates a position error signal in relation to a difference between detected position of the head and a desired position of the head, a method for attenuating externally generated vibration which is applied to the disc drive along multiple axes, comprising steps of:(a) determining a plant estimate indicative of transfer function response of the disc drive while the disc drive is operated off-line; (b) concurrently generating a plurality of acceleration signals along each of a corresponding plurality of different axes of the disc drive, each acceleration signal indicative of a different component of the externally generated vibration applied along the corresponding axis of the disc drive; (c) generating a compensation signal by adaptively filtering each of the acceleration signals in parallel and summing the resulting filtered acceleration signals; and (d) using the compensation signal to reduce effects of the externally generated vibration in the position error signal.