MAGNETOOPTICAL DISK APPARATUS AND RECORDING MEDIUM

摘要

An optical disk apparatus for effecting recording/reproduction/erasure of digital signals of mark length recording system on an optical recording medium such as an optical disk, and provides means for eliminating fluctuation of an edge position due to thermal interference between pits and for reducing the fluctuation of the edge position resulting from the change of an external environmental condition. To this end, the present invention proposes means such as: 1) for controlling the shape of a recording pulse waveform; 2) for varying the recording density to the disk in accordance with a disk position; and 3) for conducting test recording prior to recording of user data. In this way, ultra-high density optical recording can be accomplished.