Information recording medium where address mark comprising pattern suitable for prevention of detection error is recorded, and cutting apparatus for reproducing the information recording medium

A cutting apparatus for recording header data, by exposure, on a master for an information recording medium on which various pieces of information are recorded, comprising:

• recording means for effecting recording by exposure on a header field including the header data along tracks, wherein
• the header field comprises:
• a header 1 field;
• a header 2 field provided following the header 1 field;
• a header 3 field;
• and
• a header 4 field provided following the header 3 field,
• each of the header 1 field and the header 3 field includes:
• (i) a 36-byte continuously repeated pattern, (ii) an address mark in which a special pattern comprising an odd number of channel bits having a value of “1” repeats itself an even number of times, the address mark comprising a violation pattern exceeding a run length limitation in a predetermined range, and (iii) address data complying with the run length limitation in the predetermined range, a recording position of which is indicated by the address mark,
• each of the header 2 field and the header 4 field includes:
• (i) an 8-byte continuously repeated pattern, (ii) an address mark in which a special pattern comprising an odd number of channel bits having a value of “1” repeats itself an even number of times, the address mark comprising a violation pattern exceeding a run length limitation in a predetermined range, and (iii) address data complying with the run length limitation in the predetermined range, a recording position of which is indicated by the address mark, and
• the header 1 field and the header 2 field are arranged with a half track pitch shift relative to the header 3 field and the header 4 field.

An information reproducing apparatus for reproducing information recorded on an information recording medium on which various pieces of information are recorded, comprising:

• address mark detection means for detecting an address mark from a header field arranged along tracks, and
• reproducing means for reproducing address data in the header field in accordance with the address mark detected by the address mark detection means, wherein
• the header field comprises:
• a header 1 field;
• a header 2 field provided following the header 1 field;
• a header 3 field;
• and
• a header 4 field provided following the header 3 field,
• each of the header 1 field and the header 3 field includes:
• (i) a 36-byte continuously repeated pattern, (ii) an address mark in which a special pattern comprising an odd number of channel bits having a value of “1” repeats itself an even number of times, the address mark comprising a violation pattern exceeding a run length limitation in a predetermined range, and (iii) the address data complying with the run length limitation in the predetermined range, a recording position of which is indicated by the address mark,
• each of the header 2 field and the header 4 field includes:
• (i) an 8-byte continuously repeated pattern, (ii) an address mark in which a special pattern comprising an odd number of channel bits having a value of “1” repeats itself an even number of times, the address mark comprising a violation pattern exceeding a run length limitation in a predetermined range, and (iii) address data complying with the run length limitation in the predetermined range, a recording position of which is indicated by the address mark, and
• the header 1 field and the header 2 field are arranged with a half track pitch shift relative to the header 3 field and the header 4 field.