| 摘要 |
PROBLEM TO BE SOLVED: To enhance the reliability of reproducing performance. SOLUTION: As a detection operation about a page identifier(PID), the PID number in a sector is estimated. A plurality of detected PIDs are made to hold appropriately to the storing machine corresponding to the estimated PID number based on this estimated result, respectively. This enables four PIDs stored in the same sector to be discriminated exactly and to be held without canceling, for example, even if an error detection result is no good.
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