Patent ID: 7206158
Filing Date: 2007-04-17
Classification: G11B

Abstract:
1. A disk drive provided with a retract area to which a head is retracted, the head being used to read and write data from and to a disk, comprising: an actuator supporting the head such that the head is movable in a radial direction of the disk; a voice coil motor driver which drives a voice coil motor used as a drive source for the actuator; a reset circuit configured to assert a reset signal used to reset a predetermined element in the disk drive when at least one of a power-off detection signal and a drop detection signal is asserted, the power-off detection signal indicating detection of interruption of supply of power to the disk drive, the drop detection signal indicating detection of a dropping state of the disk drive, the predetermined element including the voice coil motor driver; an auxiliary power supply independent of a power supply for the disk drive; and an emergency unload circuit configured to supply the voice coil motor with a current for retracting the head to the retract area, when the reset signal is asserted, the emergency unload circuit using the auxiliary power supply as an operation power supply thereof.