OPTICAL RECORDING AND REPRODUCING METHOD, OPTICAL RECORDING AND REPRODUCING DEVICE, OPTICAL RECORDING MEDIUM

摘要

PROBLEM TO BE SOLVED: To correctly perform optical recording and reproducing while enhancing flexibility in designing of a recording layer of an optical recording medium. SOLUTION: In an optical recording and reproducing method which carries out recording and reproduction by irradiating the optical recording medium 1 which has three or more recording layers with a laser beam Z by an optical recording and reproducing device 100, the location of the recording layer of the optical recording medium 1 is measured using the laser beam Z, when the optical recording medium 1 is mounted on the optical recording and reproducing device 100. COPYRIGHT: (C)2008,JPO&INPIT