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Optical disk device recording data on a recordable or rewritable optical disk by setting a recording velocity and a recording power for each of zones on an optical disk
Optical recording medium having pits that are formed with respect to a wobbled groove at substantially constant positions in each cycle of the groove having a pit
PHASE VARIATION INFORMATION RECORDING MEDIUM AND METHOD FOR PRODUCING THE SAME, CATHODIC PULV RISA TION, METHOD OF USING PHASE VARIATION INFORMATION RECORDING MEDIUM, AND OPTICAL RECORDER