MAGNETIC HEAD CONTROL SYSTEM IN MAGNETIC DISK DEVICE OF INDEX SERVO SYSTEM

摘要

The circuit for determining the magnetic head position quickly and reducing the position determining time comprises a driving signal generator for providing step pulse to a stepping motor (14) according to the current of the position detecting coil and the position value of the head, a memory (23) for storing the current value of the position detecting coil, a first driving control circuit for driving the motor with the step pulse in servo not-used mode, and a second driving control circuit for driving the motor with the step pulse in servo used mode.