Western Digital Technologies, Inc.

Teddy T Chen

Jianguo Zhou

Guoxiao Guo

Jie Yu

Wei Xi

Abhishek Dhanda

Kuang-Yang Tu

Sanghoon Chu

Eugene C Wu

A disk drive is disclosed comprising a servo control system operable to actuate a head over a disk. A sensor signal is filtered with a first filter comprising a frequency response, and the filtered sensor signal is filtered to generate a compensated sensor signal. An error signal is filtered with a second filter comprising the frequency response, and an adaptation control signal is generated based on the compensated sensor signal and the filtered error signal. An adaptive filter is adapted in response to the adaptation control signal, wherein the adaptive filter filters the sensor signal to generate feed-forward compensation values. The feed-forward compensation values are applied to the servo control system to compensate for the disturbance. A disturbance signal that represents the disturbance is generated, and the frequency response of the first and second filters is optimized based on the sensor signal and the disturbance signal.

Disk drive optimizing filters based on sensor signal and disturbance signal for adaptive feed-forward compensation

A disk drive is disclosed comprising a disk comprising a plurality of servo tracks, wherein each servo track comprises a plurality of servo sectors. A position of the head is measured based on the servo sectors, and a compensated position of the head is generated based on the measured position of the head and a fly height of the head. The head is actuated over the disk based on the compensated position of the head.

Disk drive compensating for non-linearity of a head based on a fly height of the head

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Laguna Woods, CA, United States of America

Teddy T Chen