INFORMATION RECORDING MEDIUM, RECORDING AND REPRODUCING DEVICE, METHOD FOR CONTROLLING RECORDING AND REPRODUCING DEVICE, CONTROL PROGRAM, AND COMPUTER-READABLE RECORDING MEDIUM

摘要

PROBLEM TO BE SOLVED: To shorten the processing time until the recording or reproduction of data.SOLUTION: In an optical disk 100, the position of a BCA 101a that is an area other than a user data recording area 101c and management information recording areas 101b, 101d is set at the inner periphery or outer periphery of a recording layer 101 according to the recording direction or reproduction direction, and the BCA 101a records layer identification information for identifying the recording layer 101.