| http://www.w3.org/ns/prov#value | - Upon receiving a request from the data allocation determination unit 24 (step S501), the data allocation information managing unit 22 supplies to the data allocation determination unit 24 with the number of an innermost non-used sector on the recording surface 16, and information including the number of sectors in a non-used region beginning from the innermost non-used sector (step S502).
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