| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that recording power is shifted from the optimum value and it is difficult to satisfactorily secure reliability (signal quality) of user's recording data since effective recording sensitivity varies depending on whether another recording layer is recorded or unrecorded on the user data in a multilayered optical disc having three or more layers.SOLUTION: Information about a variation ratio of the recording power sensitivity, which varies depending on whether another recording layer is recorded or unrecorded, is recorded onto a disc control information area in advance and moreover, based on this recording-power-sensitivity variation information, recording-power correction is performed. The corresponding recording-power correction method is classified into three types: a type (1) in which the recording is performed by determining the recorded/unrecorded states of another layer, a type (2) in which, instead of determining the recorded/unrecorded states of another layer, the recording is performed using an intermediate power of the optimum powers for both of the recorded/unrecorded states, and a type (3) of combination of (1) and (2). |
