Head positioning servo for disk drive
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United States of America Patent
Stats
-
Nov 15, 1983
Grant Date -
N/A
app pub date -
Apr 27, 1981
filing date -
Apr 27, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An improved servo encoding scheme and demodulation circuit for control of the position of a read/write head with respect to a magnetic recording disk is disclosed. First and second signals of like polarity are recorded preceding each data field on the sector of the disk. The signals are summed to provide automatic gain control to the servo loop to compensate for variations in read-back amplitude, while the difference between the two signals is measured and used to provide an indication of departure of the head from the center of the disk track.
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Family
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Cited Art Landscape
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