Magnetic disc drive with safety parking position for actuator

摘要

The magnetic head (10) of a disc system is mounted at the end of a pivot-mounted arm (9) and has an actuator (6) having a coil (12) in a gap between yoke elements (13, 14), side magnets (15, 16) and permanent magnets (17, 18). The moving arm element has an inset movable permanent magnet (19). As the arm moves between a pair of fixed yokes the resisting torque rises to a maximum at the point where the arm is required to be retained as an end point.