OPTICAL DISK AND OPTICAL DISK RECORDING DEVICE

摘要

PROBLEM TO BE SOLVED: To eliminate ununiformity of reproducing signal characteristics from two recording layers generated in a writing type optical recording medium having a multilayered structure.

SOLUTION: In the optical disk having the multilayered structure which is provided with at least two recording layers capable of performing recording and reproduction and wherein recording and reproduction are performed by irradiating each recording layer with light from one side of the disk, each recording layer is provided with a data recording region in which data are written by irradiation with light for recording and an adjusting data recording region in which adjusting data of recording power of the light for recording are written.

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