Patent ID: 6560057
Filing Date: 2003-05-06
Classification: G11B

Abstract:
A disk drive including a read/write head mounted on an actuator, a disk having an inner diameter region and an outer diameter region, said read/write head radially movable by said actuator between said inner diameter region and said outer diameter region, a disk motor for rotating said disk and an unload ramp positioned at said outer diameter region, said disk drive further comprising:a control circuit for outputting control signals upon sensing a power down condition; a feedback circuit for sensing a back emf generated by said actuator and for using said back emf to apply a counter-acting first voltage to said actuator that tends to bring said actuator to a stop; and a switch device responsive to said control signals for (i) connecting said feedback circuit to said actuator to enable said actuator to be brought to said stop while said disk continues to rotate and (ii) for then causing said actuator to move said read/write head to said unload ramp.