Patent ID: 7848197
Filing Date: 2010-12-07
Classification: G11B

Abstract:
1. An information recording medium comprising: a plurality of recording layers; a test area for determining a recording power of a laser light for each of the plurality of recording layers, and a plurality of buffer areas, wherein a first test area of a first layer and a second test area of a second layer adjacent to the first layer are provided at different radial positions such that the first test area of the first layer overlaps a region of the adjacent second layer provided for purposes other than a test area, the first test area being located closer to an inside circumference side and the second test area being located closer to an outside circumference side, wherein a first buffer area among the plurality of buffer areas is located just before the first test area, a second buffer area among the plurality of buffer areas is located just after the first test area, a third buffer area among the plurality of buffer areas is located just before the second test area, a fourth buffer area among the plurality of buffer areas is located just after the second test area, wherein a recording power of the first layer is decided by using the first test area from the inside circumference side, and wherein a recording power of the second layer is decided by using the second test area from the outside circumference side.