| 摘要 |
<p>It is possible to provide a run-in region bit pattern wherein data is stably reproduced even if the optical disc recording density is increased. Provided is an optical disc which has a plurality of tracks each track divided into a plurality of recording blocks. Each of the recording blocks has a run-in region and a data region. In the run-in region, a predetermined run-in bit pattern can be recorded. The data region can be used for recording a bit pattern of various types of bit lengths obtained by modifying data to be recorded according to a predetermined modulation rule. In the optical disc, among the bit patterns having the plurality of types of bit lengths, at least one of the space frequencies corresponding to the respective bit patterns is higher than the OTF cut-off frequency. The run-in bit patterns recorded in the run-in region are the bit patterns excluding those having the space frequency higher than the OTF cut-off frequency among the bit patterns having the plurality of types of bit lengths.</p> |
