Apparatus and method of controlling the on-track position of an actuator in a hard disk drive to be held on a predetermined position of a track. The apparatus includes a voice coil motor (VCM) driving unit, a position detecting unit, and a controller. The voice coil motor (VCM) driving unit applies a...http://www.google.de/patents/US6414815?utm_source=gb-gplus-sharePatent US6414815 - Apparatus and method for controlling on-track operation of an actuator in a hard disk drive
