| 摘要 |
PROBLEM TO BE SOLVED: To provide a new method and a unit for searching a usable substitution block of a rewritable optical recording medium. SOLUTION: When one entry or more registered to SDL exist, while an entry to which the substitution block is assigned does not exist, a first normal block in a spare area is determined to be a first usable substitution block. At that time, when a substitution area is located after a user area, a normal block following the last data block of the user area is decided to be the first usable substitution block. Accordingly, even when only the SDL entry to which the substitution block is not assigned exists, an incorrect substitution block is prevented from being searched. COPYRIGHT: (C)2009,JPO&INPIT
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