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

摘要

PROBLEM TO BE SOLVED: To perform reliable recording/reproduction without depending on the number of recording layers in a multilayer optical disk.

SOLUTION: In an optical recording medium having two or more recording surfaces nearly vertical to a beam traveling direction for one recording layer, optical distances from the beam incident surface of the optical recording medium to a high reflectance metal layer R are the same regardless of the number of recording layers. A unique ID unique to the optical recording medium is recorded in only the high reflectance metal layer R and recording/reproduction to each recording surface (S0 to S5) can be reliably performed by performing spherical aberration correction to the high reflectance metal layer R first.

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