Patent ID: 7072135

Claim:
A head retracting method for retracting a head which at least reads information for an information recorded disk to a retract position according to the power supply failure, comprising: a first step of moving-controlling said head to a predetermined position contacting a stopper in an opposite direction from said retract position such that the velocity of said head becomes constant in the vicinity of said predetermined position; a second step of moving-controlling said head to said retract position after said head reaches said predetermined position such that the velocity of said head becomes constant in the vicinity of said retract position; and a third step of monitoring the velocity of said head after said movement control of said first step and shifting to said second step when the velocity of said head is a predetermined velocity or less for a first predetermined period of time while said head is in contact with said stopper, wherein the velocity of said head is monitored by detecting a back electromotive force of an actuator for moving said head.