A REWRITABLE OPTICAL DISC

摘要

A rewritable optical disk (2) according to this invention is capable of rewriting user data and is capable of using as a postscript type optical disk, wherein there is a written sector flag area, being set a flag indicating whether or not user recording area is recorded in every sector, out of the user recording area, so as to be capable of detecting whether or not the user recording area is recorded in every sector easily and be capable of inhibiting information data from recording.