DISK-TYPE RECORDING MEDIUM WHERE ADDITIONAL INFORMATION IS RECORDED BY DISK TRACK SHAPING, A DISK TRACK SHAPING METHOD FOR THE RECORDING MEDIUM, AND A RECORDING MEDIUM FOR RECORDING A PROGRAM FOR REALIZING THE DISK TRACK SHAPING METHOD, PARTICULARLY CONCERNED WITH PREVENTING ADDITIONAL INFORMATION DETECTION PERFORMANCE FROM DETERIORATING OWING TO DISK MINIATURIZATION

摘要

PURPOSE: A disk-type recording medium where additional information is recorded by disk track shaping, a disk track shaping method using the recording medium, and a recording medium for recording a program for realizing the disk track shaping method are provided to express additional information by shaping a groove or land track of a disk in wobble shape, thereby preventing additional information detection performance from deteriorating while reducing harmonic noise. CONSTITUTION: A data frame includes plural synchronous frames. The number of the synchronous frames is determined by considering a length of the innermost side of a disk-type recording medium. The number of the synchronous frames is 'N/d', and here 'd' is determined such that a length of the data frame can be smaller than or equal to a length of the innermost length of the disk-type recording medium, while 'N' and 'd' are positive integers.