Magnetic disk apparatus
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United States of America Patent
Stats
-
Jan 8, 1991
Grant Date -
N/A
app pub date -
Jul 14, 1989
filing date -
Jul 15, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method of forming servo information in a magnetic disk apparatus of a sector servo system. Servo information is recorded in advance at the beginning of each of the sectors, and includes a DC erase signal, a track address signal and a burst signal. The track address signal indicates on which track of the magnetic disk the sector is located, and is formed by expressing the track address in Gray code and interleaving a dummy code into the Gray code. Servo information is recorded using an NRZI system or an RLL coding method. Servo information in which the dummy code is interleaved is decoded after the dummy code is removed at the time of demodulation.
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