Maxtor Corporation

Mohamad A Rezvani

Michael Anthony Moser

Stanley H Shepherd

Yakov M Lifchits

Ching-Tzuen Tarn

A spindle motor control for a disk drive including a spindle motor for rotating a data disk at a desired rotational speed, and a data transducer head positionable relative to selected ones of a multiplicity of concentric data tracks formed on a data storage surface of the data disk by a head position actuator structure operating within a head position servo loop, wherein the concentric data tracks are periodically interrupted by a plurality of servo sectors per rotation, each servo sector recorded with head position information. The spindle motor control includes: a servo detector for detecting the head position information in at least one servo sector on a selected track under the transducer head in relation to a timing signal at a reference frequency; a position detector for determining the circumferential position of the detected head position information on the selected track in relation to the timing signal; and a controller for controlling the rotational speed of the spindle motor as a function of said circumferential position, to regulate the circumferential position of the transducer in relation to the servo sectors on the data tracks.

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San Jose, CA, United States of America

Mohamad A Rezvani