INFORMATION RECORDING MEDIUM, INFORMATION RECORDING DEVICE AND METHOD AND COMPUTER PROGRAM

摘要

An information recording medium is provided with a first recording layer for recording recording information by laser beam (LB) irradiation, and a second recording layer (L1 layer) for recording recording information by laser beam irradiation through the first recording layer (L0 layer). The second recording layer is provided for recording pattern information for calculating optimum power of the laser beam. In the second recording layer, a first calibration area (113), which corresponds to a recording area (104) in the first recording layer wherein no recording information is recorded, is provided, and a leading head part in the first calibration area is arranged at a position which is shifted by a prescribed distance in a pattern information recording direction, having the head part of the unrecorded recording area as reference.