| 摘要 |
An automatic replacing method is applicable to a magnetic disc drive (3) used particularly in reading data. When a sign that a unit (sector) at which information is handled may be defective at the time of a reading error is detected (saving threshold ), the information in that unit is temporarily stored (saved) in a temporary storage area (backup area). If the unit showing the sign is judged to be definitely defective, the information in that unit is transferred to a safe storage area (replacement area). Thus, fatal reading errors and negligible reading errors can be treated separately.
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