Disk runout compensator
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United States of America Patent
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-
Dec 9, 1986
Issued Date -
N/A
app pub date -
Sep 25, 1984
filing date -
Sep 25, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method and apparatus are provided to compensate for the runout that commonly occurs during the reading from or writing of information on the surface of a disk medium using a read/write head. The runout relates to the distance the head is located away from a disk track center during the rotation of the disk. To maintain the head in alignment with the track center during the complete revolution of the disk, position information is obtained. This position information is used with discrete fourier transform techniques to provide a representation of the disk runout. From this representation, a compensating signal can be generated to provide movement of the head that compensates for the runout and keeps the head positioned in alignment with the track center at all times during the disk rotation.
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