| 摘要 |
The invention aims to provide a recordable dual-layer optical disc which allows precise recording learning on both layers. A first information recording layer located further from the light incidence side includes a read-only control data area ( 304 a), a first test area ( 306 a), and a second test area ( 315 a). A second information layer located closer to the light incidence side includes a third test area ( 304 b) located at a position opposite to the control data area ( 304 a), and a fourth test area ( 315 b) located at a position opposite to the second test area ( 315 a).
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