| http://www.w3.org/ns/prov#value | - According to the present invention, it is preferable that the retry read step further comprises a first retry read step, a step of DC erasing of the sector of the predetermined track corresponding to the sector which could not be read is executed when there is a section which cannot be read in the first retry read, and a step of executing a retry read of the sector which could not be read in the f
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