FIELD: information technology.
SUBSTANCE: data medium includes a control information region for recording control information for controlling the recording status, and a user data region. The user data region has such a configuration that it contains a recording region. A session has such a configuration that it contains a recording region. The control information contains interval information with indication of the recording interval of the recording region and identification information for identifying the recording region lying on the session boundary, as well as array of record numbers of recorded recording regions, indicating the recorded recording region. Identification information is a flag given for the recording region. The flag has a value equal to "0" or "1". The method includes a step of deleting the number for a predetermined recording region of a recording region from the array of numbers of recorded recording regions without recording any data in the predetermined recording region.
EFFECT: reduced volume of information for identifying a session boundary.
25 dwg
