Patent ID: 8363531

Claim:
A recordable optical disk as a plural-layer disk comprising: at least three recording layers configured to be provided over a disk substrate; and an optically-transparent layer configured to be formed on a laser-incident surface side, wherein a test area for laser power control is provided in an inner circumference side area closer to an inner circumference than a data zone in which user data is recorded in each of the recording layers, and the test areas in the recording layers are so disposed as to be prevented from overlapping with each other in a layer direction by way of gaps (G 1 /G 2 ), wherein the gaps (G 1 /G 2 ) between the test areas are each 222 μm or more, a management information recording/reproduction area for recording and reproduction of management information is provided in the inner circumference side area in each of the recording layers, and the management information recording/reproduction areas are so disposed that, for each of the test areas in the recording layers, one or less management information recording/reproduction areas overlap with the test area in the layer direction at a position closer to a laser-incident surface than the test area.