OPTICAL DISK, OPTICAL DISK RECORDING AND REPRODUCING DEVICE, ITS METHOD AND OPTICAL DISK ORIGINAL BOARD MANUFACTURING DEVICE

摘要

PROBLEM TO BE SOLVED: To provide an optical disk capable of densely and precisely recording and reproducing data. SOLUTION: Relating to an optical disk where tracks for recording data are formed respectively in guiding grooves and between the guiding grooves, an address mark according to the form of the data bit of each address information is divide-composed of plural mark parts (the address mark is composed of at least three mark parts, e.g.) respectively on each side face of the grooves and the parts between the grooves and the address mark is formed in the grooves and between the grooves so that the phase of at least one mark part among the respective plural mark parts of these may nearly coincide with each other between an adjacent groove and a part between the groove.