Patent ID: 7944786
Filing Date: 2011-05-17
Classification: G11B

Abstract:
1. An optical disk comprising: a first recording layer having a read/write direction from an inner periphery of the optical disk to an outer periphery of the optical disk; a second recording layer having a read/write direction from the outer periphery of the optical disk to the inner periphery of the optical disk; a first test recording area on the first recording layer, the first test recording area including a plurality of sections to be used consecutively from the outer periphery of the optical disk to the inner periphery of the optical disk for performing test recording; a second test recording area on the second recording layer, the second test recording area including a plurality of sections to be used consecutively from the inner periphery of the optical disk to the outer periphery of the optical disk for performing test recording; a first data area in which user data is to be written with a recording power determined by the test recording on the first test recording area; and a second data area in which user data is to be written with a recording power determined by the test recording on the second test recording area, wherein the first and second recording layers are write once recording layers which can record data only once to a same place, and in the first and second data areas, the user data is to be recorded in a unit of a block, the block being a unit of recording to which error correction is applied.