Patent ID: 6841954

Claim:
A disk drive using a disk as a recording medium, comprising: a spindle motor which rotates the disk; a driver circuit which drives the spindle motor by supplying a current to the spindle motor; a first control circuit which controls the spindle motor via the driver circuit to start up the spindle motor in a first mode; a second control circuit which controls the spindle motor via the driver circuit to rotate the spindle motor at a rated speed in a second mode; a voltage booster which boosts a power supply voltage from a disk drive power supply; a voltage selector which selects, in the first mode as a voltage applied to the driver circuit, the power supply voltage boosted by the booster, and selects, in the second mode as the voltage applied to the driver circuit, the power supply voltage from the disk drive power supply; and a controller which sets the first mode to start up the spindle motor, and sets the second mode when the spindle motor has been started up.