Fujitsu Corporation

Takehiko Katoh

Kazuhiko Takaishi

Takashi Matsumoto

Norio Yagi

Kenichi Myokan

Kunihiro Shimada

A magnetic disk drive for locking an actuator mounted with a magnetic head in a safety zone. The magnetic disk drive comprises a magnet, fixed yoke members and a stopper for setting a stop position of rotations of the rotary actuator in such a position that torque by the fixed yoke members and the magnet is maximized. The fixed yoke members form a magnetic circuit for the magnet in all or a part of a movable range of the rotary actuator. The fixed yoke members include a first area having a gap width uniformly reduced in a lock direction to retract the rotary actuator and a second area having a gap width smaller than a gap width of the first area. The fixed yoke members are mechanically separated from each other. The fixed yoke members further include a second area having a minimum gap width to lock the rotary actuator, a first area having such a gap that a gap width becomes smaller as it approaches the second area and a third area formed between the second area and the first area and having a gap width larger than a gap width of the second area.

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Kawasaki, Japan

Takehiko Katoh