Disk drive for quickly retracting head to retract area, and emergency head-unload control circuit for use in the disk drive
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United States of America Patent
Stats
-
Apr 17, 2007
Grant Date -
Dec 1, 2005
app pub date -
Jan 21, 2005
filing date -
May 31, 2004
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A reset circuit asserts a reset signal when at least a power-off detection signal or a drop detection signal is asserted. When the reset signal is asserted, an emergency unload circuit supplies a voice coil motor with a current for retracting the head to the retract area. The emergency unload circuit uses an auxiliary power supply as an operation power supply thereof.
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