Patent ID: 6639749
Filing Date: 2003-10-28
Classification: G11B

Abstract:
A method for unloading a transducer assembly to a ramp positioned outside an outer diameter of a disc in a disc drive system including a spindle motor for rotating the disc and a positioning coil coupled to a power supply for moving the transducer assembly relative to the disc, the method comprising:(A) rotating the disc at a first rotational velocity equaling a normal operational rotational velocity of the disc drive system; (B) receiving a retract signal; (C) accelerating rotation of the disc to a second rotational velocity that exceeds the normal operational rotational velocity of the disc drive system, responsive to the retract signal; (D) decoupling power provided to the spindle motor; (E) energizing the positioning coil with output from the power supply to retract the transducer assembly to the ramp, responsive to the retract signal; and (F) energizing the positioning coil with back voltage generated from the spindle motor to retract the transducer assembly to the ramp, concurrently with operation (E).