| 摘要 |
Disclosed herein is a magnetic disk drive including a head actuator for moving a head across tracks of a magnetic disk. The head actuator includes an actuator arm rotatably mounted in a housing, for supporting at its tip the head. The magnetic disk drive further includes an inner stopper adapted to come into contact with the actuator arm, for stopping excess movement of the actuator arm toward an inner circumferential portion of the disk, and an outer stopper adapted to come into contact with the actuator arm, for stopping excess movement of the actuator arm toward an outer circumferential portion of the disk. The inner stopper is the same in structure as the outer stopper. Each of the inner stopper and the outer stopper includes a shaft fixed to a base of the housing and having an outer circumferential surface formed with an annular groove, and a cylindrical rubber cushion mounted on the outer circumferential surface of the shaft so as to cover the annular groove.
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