Patent ID: 6600710
Filing Date: 2003-07-29
Classification: G11B

Abstract:
An information recording medium including a plurality of sector fields, and having various pieces of information recorded in the sector fields, wherein the 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, and 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, the header 2 field, the header 3 field and the header 4 field includes: (i) a continuously repeated pattern, (ii) an address mark in which a special pattern comprising an odd number of channel bits having a value of â€œ1 â€  repeats itself an even number of times, the address mark comprising a violation pattern exceeding a run length limitation in a predetermined range, (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 (iv) a sector number, and the relationship in magnitude between the sector number included in each of the header 1 field and the header 2 field and the sector number included in each of the header 3 field and the header 4 field is indicative of whether said recording field is a land or a groove.