FIELD: information technologies.
SUBSTANCE: information on length of channel bit is written in the utility area (BCA) of an optical disk in the form of crinkles. The optimal mode of playback/data record is performed on the basis of the control information concerning disk capacity. Alternatively, during consecutive performance of variety of the bit detection preset modes, values of error rate on bits are calculated, and play back the bit detectings that are given in a mode, corresponding to the least value of error rate. It helps to perform operation of data playback, optimal in relation to capacity when recording Blue-ray disk only for reading from BD-ROM even in a case when the disk information (DI) is written in allowed band of the constant information and control data (PIC) in the record format demanding process of decoding, and the capacity during recording process may have any of the following values: 23 Gbytes, 25 Gbytes, 27 Gbytes, etc.
EFFECT: increase of the device efficiency.
32 cl, 8 dwg
