Single stage seek method

G - Physics – 11 – B

Patent

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352/21.33

G11B 21/08 (2006.01) G11B 5/55 (2006.01) G11B 7/085 (2006.01)

Patent

CA 1322789

ABSTRACT OF THE PRESENT INVENTION A seek method for disk drives is described. In the seek method of the present invention, the tracking servo loop remains in a track positioning mode throughout the entire seek process. By effectively varying the reference position of the head with respect to track center under a predetermined profile, the track positioning mode is utilized to produce a pseudo-continuous movement across the disk surface. In essence, the servo track following loop attempts to maintain position relative to a local track center as dictated by profile information supplied by a microprocessor. The system of the present invention is an open loop in the sense that no attempt is made to loop information about deviation from the predefined profile back to the microprocessor. Local positioning, however, remains closed loop at all times so that the system is always within the predicted track and arrives directly on target.

613664

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