| 摘要 |
A disk storage device has a plurality of disk faces and a plurality of heads. The disk storage device protects the data on the disk face for a head before the defect of the head occurs. For each head, a table for accumulating the error generation count generated by the operation of a head is provided. And a control unit predicts the defect of one head based on the accumulated error generation count, reads data on the corresponding disk face by the head of which the defect was predicted, and writes the read data to another corresponding disk face by another head. Since the defect of a head can be predicted, the data can be protected in advance.
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