| 摘要 |
PURPOSE: A disk drive system and a hard disk drive are provided to improve the reading speed or writing speed when the rotation speed of a discoid medium showed by a magnetic disk. CONSTITUTION: A disk drive system(10) comprises: a discoid medium(22) rotating about the rotation axis and storing data; an actuator(30) having a head for reading or writing data from or in the discoid medium and bi-directionally rotating about the bi-directional-rotation axis; and a housing having a predetermined width and housing the discoid medium and the actuator. The rotation axis of the discoid medium and the bi-directional-rotation axis of the actuator are arranged at the center in the width direction of the housing, and the size of the discoid medium is smaller than the size of a discoid medium corresponding to a form factor of the housing.
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