Patent ID: 8325584

Claim:
A storage medium comprising a data area, a data lead-in area being inside the data area, and a system lead-in area being inside the data lead-in area and having a track pitch longer than a track pitch of the data lead-in area, wherein modulation data is stored in the data area, Non Return to Zero Inverting technique is utilized for the modulation data, the modulation data has a minimum length and a maximum length which relate to the Non Return to Zero Inverting technique, the modulation data is represented by a channel bit length T, the minimum length corresponds to 2T, the modulation data is configured to generate a reproduction signal when a reproducing apparatus reproduces the modulation data, an amplitude I 3 of the reproduction signal is generated by a mark regarding 3T and a space regarding 3T or is generated by a pit regarding 3T and the space regarding the length of 3T, a maximum amplitude of the reproduction signal is generated by a mark regarding the maximum length and a space regarding the maximum length or is generated by a pit regarding the maximum length and the space regarding the maximum length, and a ratio of the amplitude I 3 to the maximum amplitude is more than 0.2.