Patent ID: 7974038

Claim:
A servo writer for writing servo data onto a disk of a disk drive, the servo writer comprising: a push-pin operable to contact an actuator arm of the disk drive, wherein the actuator arm comprises a voice coil coupled to a base of the actuator arm and a head coupled to a distal end of the actuator arm; an actuator for actuating the push-pin; a retract capacitor; and control circuitry operable to apply a current from the retract capacitor to the voice coil in order to retract the actuator arm if a power failure occurs while actuating the push-pin; wherein: the control circuitry comprises a voltage regulator for generating a regulated voltage in response to the retract capacitor, where the regulated voltage is applied across the voice coil to generate the current applied to the voice coil; the voltage regulator is configurable to apply a maximum current to the voice coil selected from a plurality of possible maximum currents; and the maximum current is selected based on a type of disk drive being servo written.