Patent ID: 7075745
Filing Date: 2006-07-11
Classification: G11B

Abstract:
1. A disk drive apparatus for controlling, under supply of a power voltage having a predetermined rating voltage level, a head drive section to position a head in a radial direction of an information recording disk and carry out a write and/or read operation of information while rotatively driving the information recording disk by a rotation drive motor, said disk drive apparatus comprising: a voltage level monitor for monitoring the level of the power voltage with reference to each of an intermediate voltage level and a bottom voltage level, where the intermediate voltage level is lower than the rating voltage level, and the bottom voltage level is lower than the intermediate voltage level; a normal retract section for controlling said head drive section to cause said head to move in a direction toward a retract position, using the power voltage, in response to the monitored level of the power voltage being below the intermediate voltage level; and a forcible retract section for controlling said head drive section to forcibly bring the head to the retract position in response to the monitored level of the power voltage being below the bottom voltage level.