| 摘要 |
PURPOSE:To record always information in an optimum state by recording the recording condition of an optical beam for a recording medium on the recording medium. CONSTITUTION:Track numbers 0, 1... are given to tracks in order from the innermost track, and the innermost track 0 is used as the area where management information of a disc is recorded and is used in distinction from areas where normal data are recorded. One specific sector of this track 0 is used as the area where the optical beam recording conditions to the recording medium, namely, optimum recording laser power information, optimum bias magnetic field intensity information, optimum erasing power information, and optimum reproducing power information are recorded, and the photomagnetic effect is used to record these information in 4 bytes from the beginning of the data area of this sector. |
