Patent ID: 6476995
Filing Date: 2002-11-05
Classification: G11B

Abstract:
A servo track writer for writing servo information to a head disc assembly, the head disc assembly including a disc attached to a base with a spindle bearing, and a rotary actuator adjacent the disc, the actuator including a read/write head for selectively magnetizing the disc, the servo track writer comprising:a mounting fixture for mounting the head disc assembly, the mounting fixture providing a mechanical reference for the servo track writer as servo information is written to the head disc assembly; a pusher block assembly, mounted to the mounting fixture proximate the actuator of the bead disc assembly, for mechanically positioning the actuator; and a position control system for controlling the position of the actuator, the position control system further comprising: a motor connected to the pusher block assembly; and a controller for outputting control signals to the motor in order to adjust the position of the actuator with respect to the disc, the controller synchronizing the motion of the actuator to a cage frequency of the spindle bearing.