| 摘要 |
A test recording is performed with respect to an optical disc prior to a regular recording, and a beta value for setting a qualitative parameter relating to the level of the recording state within a preferable range is derived from a result of the test recording. Then, the recording velocity at which the derived beta value or the writing laser power value is within the preferable value can be obtained. Therefore, the recording velocity at which the satisfactory recording can be realized with few recording errors can be determined. Further, a relation between a writing laser power value and a Deltabeta value is obtained from the reproduced signal from the test record area, and the writing laser power value is determined considering the Deltabeta value. Therefore, it is possible to determine the writing laser power value for performing a satisfactory recording even with the optical disc having a characteristic of a so-called beta significant point at which the beta value significantly changes with respect to the writing laser power value.
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