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Abstract

A head positioning apparatus and method for a disk drive system. During each computing time of a plurality of sequential computing times: (a) a position of a servo head on a disk is computed, (b) an actual position of the servo head in the present computing time is computed, based on the computed position of the servo head and an estimated position of the servo head computed in the preceding computing time, (c) a moving distance of the servo head is computed, based on the actual positions of the servo head computed in the present computing time and in the preceding computing time, (d) an estimated position of the servo head in the present computing time, indicating an estimated position reached by the servo head at the succeeding computing time, is computed from the actual position of the servo head computed in the present computing time to the moving distance of the servo head, (e) a moving velocity of the servo head is computed based on the actual position of the servo head computed in the present computing time and the actual position of the servo head computed in the preceding computing time, (f) a remaining number of tracks up to a target track is computed, based on the actual position of the servo head computed in the present computing time, and (g) an object velocity of the servo head is obtained, based on the remaining number of tracks.

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First Claim