Disk drive using VCM BEMF feed-forward compensation to write servo data to a disk
AssigneeWestern Digital Technologies, Inc.
InventorsBrian P. Rigney, Jianbin Nie, Stanley H. Shepherd
Life of this patent
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Abstract
A disk drive is disclosed comprising a voice coil motor (VCM) configured to actuate a head over a disk. The VCM is controlled to seek the head over the disk during a first seek, and a back electromotive force (BEMF) voltage generated by the VCM during the first seek is measured. Feed-forward compensation is generated based on the measured BEMF voltage, and the VCM is controlled to seek the head over the disk during a second seek using the feed-forward compensation while writing servo data to the disk.
Claims16
A disk drive comprising:
- a disk;
- a head;
- a voice coil motor (VCM) configured to actuate the head over the disk;
- and
- control circuitry configured to:
- control the VCM to seek the head over the disk during a first seek;
- measure a back electromotive force (BEMF) voltage generated by the VCM during the first seek;
- generate feed-forward compensation based on the measured BEMF voltage;
- control the VCM to seek the head over the disk during a second seek using the feed-forward compensation;
- and
- write servo data to the disk during the second seek.
A method of operating a disk drive, the method comprising:
- controlling a voice coil motor (VCM) to seek a head over a disk during a first seek;
- measuring a back electromotive force (BEMF) voltage generated by the VCM during the first seek;
- generating feed-forward compensation based on the measured BEMF voltage;
- controlling the VCM to seek the head over the disk during a second seek using the feed-forward compensation;
- and
- writing servo data to the disk during the second seek.
Dependencies are inferred from the claim text.