| 摘要 |
According to one embodiment, a disk drive having a head-motion control system. The disk drive comprises a defect evading unit. The defect evading unit includes a defect-approach determining unit and an evasion-orbit defining unit. The defect-approach determining unit determines a position near a defective part, which the head is approaching, on the basis of defect position information. The evasion-orbit defining unit changes the motion orbit of the head on the basis of the position determined by the defect-approach determining unit, thereby making the head evade the defective part.
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