Patent ID: 6674708
Filing Date: 2004-01-06
Classification: G11B

Abstract:
An information recording medium including a plurality of sector fields arranged along tracks, and having various pieces of information recorded in the sector fields, whereinthe sector field comprises: a header field; and a recording field on/from which data is recorded/reproduced on the basis of data recorded in the header field, 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 â€œ1â€  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 fluid 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 â€œ1â€  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.