MULTI-LAYER INFORMATION RECORDING MEDIUM, INFORMATION RECORDING/REPRODUCING DEVICE AND MULTI-LAYER INFORMATION RECORDING MEDIUM MANUFACTURING METHOD

摘要

By assuring lower compatibility with information recording media already on the market or of known formats, information is recorded/reproduced on/from a multi-layer information recording medium of a new format using an information recording/reproducing device already widely in use. The multi-layer information recording medium includes a plurality of layered information planes L0 to L3, which include a first and a second information planes L0, L1 each having a BCA and a pre-recorded area (first reflecting surface) for reflecting a light with a specified first reflected light power when the light is incident and a third and a fourth information planes L2, L3 each having a low reflectivity area (second reflecting surface) for reflecting the light with a second reflected light power smaller than the first reflected light power.