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isa:219453269
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According to the present invention, it is detected whether the sector is a sector which is difficult to read due to an off track write, and offset DC erasing is executed for the sector of the adjacent track where an off track write occurred even if an offset read retry is unsuccessful, so the read success ratio of the sector improves, and only that sector is rewritten.
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isap:394260549
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isa:219453269