| 摘要 |
PURPOSE: To make it possible to utilize specific patterns for decision as to whether a normal disk or not by recording the appearance frequency and appearance sequence of a Q mode stored in a Q channel constituting sub-code data with specific patterns. CONSTITUTION: This optical disk is constituted (1) to record the appearance frequency and appearance sequence of the Q mode stored in the Q channel constituting the sub-code data with the specific patterns, (2) to set and record program search data stored in the P channel (CH) constituting the sub-code data (SD) at a specific value, (3) to record the appearance sequence of the control data stored in the QCH constituting the SD with specific patterns, (4) to record the appearance sequence of the specific bit in the control data stored in the QCH constituting the SD with specific patterns, (5) to record the number of the tracks and pointers in the Q data stored in the QCH constituting the SD in a lead-in region with specific sequence and (6) to set and record the actual reproduction time data of respective pieces of the track information constituting the SD with specific accuracy. The disk is decided to be the normal disk if the disk has these specific forms. |
