| 摘要 |
PROBLEM TO BE SOLVED: To decrease the frequencies at which alternating processing is carried out. SOLUTION: When an address ID (1, 2) of a desired sector cannot be detected (S011 to S009), the address ID (1, 2) of the previous sector is detected and a CRC check (S010 to S016) is carried out. When the result of the check is discriminated to be 'OK', the sector mark of the desired sector is detected (S017) and the correction of the count value of a sector length counter is performed (S018) and recording is executed (S020) in accordance with the count value (S019).
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