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

摘要

In an optical recording/reproducing method, a laser beam (Z) is applied by an optical recording/reproducing device, and information is recorded and reproduced on and from the optical recording medium having three or more recording layers. When the optical recording medium is mounted on the optical recording/reproducing device, the position of the optical recording medium is measured by using the laser beam (Z). Thus, accurate optical recording/reproduction is performed with an improved degree of freedom in designing of the recording layer of the optical recording medium.