| 摘要 |
PROBLEM TO BE SOLVED: To provide a composite disk to be used alone as, for example a CD disk and a DVD disk. SOLUTION: This composite disk 30 is provided with a first recording area 31 (CVD area) formed to reproduce a signal by a first laser light having the waveform of a 635 nm or 630 nm band, and a second recording area 32 (CD area) formed to reproduce a signal by a second laser light having the waveform of a 780 nm band. The center position C2 of the second recording area 32 is made eccentric from the rotational center C0 of a disk by about 50 μm, and the center position C1 of the first recording area 31 is limited to the eccentricity of 20 μm or lower from the rotational center C0 of the disk. |
