Patent ID: 8582414

Claim:
An information storage medium for storing modulated data, comprising: a burst cutting area including a first area; a system lead-in area located outward of the burst cutting area and including a second area; and a data lead-in area located outward of the system lead-in area and including a third area, wherein the system lead-in area comprises a read-only area, the data lead-in area comprises a recordable area, the first area, the second area, and the third area are configured to store same information relating to a recorded mark polarity flag, the recorded mark polarity flag is set to 0 or 1, the recorded mark polarity flag set to 0 indicates that recorded marks have a lower reflectivity than an unrecorded area, the recorded mark polarity flag set to 1 indicates that recorded marks have a higher reflectivity than an unrecorded area, the modulated data has a minimum inversion length and a maximum inversion length, the minimum inversion length corresponds to 2T, T being a channel bit length T of the modulated data, the modulated data is configured to be reproduced by a reproducing apparatus, the modulated data is configured to produce a reproduction signal when the reproducing apparatus reproduces the modulated data, a high level value of a reproduction signal amplitude is a highest value reproduced from an area regarding the maximum inversion length, a low level value of the reproduction signal amplitude is a lowest value reproduced from an area regarding the maximum inversion length, a differential value is defined as a difference between the high level value and the low level value, and ratio of the differential value to the high level value is more than 0.2.