OPTICAL DISK DEVICE, OPTICAL DISK RECORDED/UNRECORDED BOUNDARY DETECTION METHOD, OPTICAL DISK RECORDED/UNRECORDED BOUNDARY DETECTION PROGRAM

摘要

PROBLEM TO BE SOLVED: To provide an optical disk device, an optical disk recorded/unrecorded boundary detection method and a program thereof capable of reducing a false detection of a boundary between regions with and without recorded data in an optical disk.;SOLUTION: An optical disk of the present invention comprises: a recorded/unrecorded signal generation section to generate, based on a readout signal read from the optical disk, a recorded/unrecorded signal which indicates existence or non-existence of recorded data at a position where the readout signal is read; and a boundary detection section, in order to detect a boundary between a region where data is recorded and the region where data is not recorded, when a detection of a first position where the recorded/unrecorded signal indicates the existence of the recorded data is continuously followed by the detection of a second position where the recorded/unrecorded signal indicates the non-existence of the recorded data, selects a middle position between the first position and the second position as a candidate recorded/unrecorded boundary. The boundary detection section confirms the candidate boundary as a real boundary when the recorded/unrecorded signals at all the positions in a region started from the second position to Nth position (where N is an integer equal to or more than 1) indicate the non-existence of data.;COPYRIGHT: (C)2012,JPO&INPIT