| 摘要 |
PROBLEM TO BE SOLVED: To provide a magnetic disk for automatically restoring data in a magnetic disk unit while suppressing overhead without shortening unit's lifetime. SOLUTION: When an automatic restoration request signal 114 is issued and selected by a request contention part 106, data is read out from an address indicated by an automatic restoration address register 105 (step 501). When an error is found by an error check, the data on a recording medium is overwritten by a data restoration function (step 502). Afterwards, the value of the automatic restoration address register 105 is updated (step 503). A predetermined amount of data is checked and restored with respect to one-time automatic restoration processing request, and the processing is completed. The predetermined amount here means, for example, a data volume recorded in one track of the magnetic disk. Further, the value of the automatic restoration address register 105 is saved in an nonvolatile storage area at a constant frequency (step 504). COPYRIGHT: (C)2007,JPO&INPIT
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