| 摘要 |
PROBLEM TO BE SOLVED: To set an adequate recording power of a laser beam for an alloy disc. SOLUTION: S005) When a host computer feeds a record command, the write and verify is executed. S008) If the write and verify results in NG, the write and verify is executed at a change area of required test zone. S012) If the judgment results in NG a specified number of times, distinction is executed, based on disc type information at a phase encoding part zone and if the disc is determined to be an alloy type, a power calibration is executed, based on the amplitude of a playback RF signal. |
