| 摘要 |
PROBLEM TO BE SOLVED: To prevent a nano-unit irregular structure, which is formed on a magnetic layer of a magneto-optical recording medium, from being destroyed due to the irradiation of the medium with a laser beam of excessive power, so as to sufficiently exhibit an effect in the magneto-optical recording medium. SOLUTION: A test recording area as well as a data recording area is set, and irregular structures are formed at least on the magnetic layers of the data recording area and test recording area with a pitch which is shorter than the wavelength of a laser beam for recording. When recording laser power is set, test recording is made to the test recording area, and a variation in reflectance before and after the test recording is measured. At that time, when a reflectance after the test recording increases at a prescribed rate or more, the power is reduced since the laser power is excessively large. When a reflectance after the test recording does not exceed a prescribed rate, whether data subjected to the test recording can adequately be reproduced is determined. If the reproduction is possible, the power at that time is set to be power in recording. COPYRIGHT: (C)2006,JPO&NCIPI
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