| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical disk which makes the constitution of a demodulating circuit simple. SOLUTION: The optical disk which has tracks is provided with wobble parts which zigzag and non-wobble parts which do not zigzag on the tracks and 1st subordinate information and 2nd subordinate information as data other than user data are superimposed and stored on the track by using combinations of the wobble parts and non-wobble parts; and for the 1st subordinate information, at least the length of the wobble parts or non-wobble parts is made different according to whether bits has a logical value '0' or '1' and for the 2nd subordinate information, the phase of the zigzagging of the bits at the wobble parts is made different from the phase of the zigzagging of the last bits at the wobble parts only when the bits have the logical value '1'. |
