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

摘要

PROBLEM TO BE SOLVED: To enable high-density recording and reproducing by diminishing a recording region of control signals, and to form clock signals with less jitters while reproduces the control signals with less distortion in waveforms. SOLUTION: Grooves G and/or lands L constituting recording tracks of the optical recording medium 1 have interrupted segments of a prescribed length in the direction of the recording tacks, and the interrupted segments are clock marks for obtaining the clock signals. CM<=1.0 is specified when (clock mark length C1)/(beam spot diameter D1)=CM is defined.