Patent ID: 6781939
Filing Date: 2004-08-24
Classification: G11B

Abstract:
An information recording medium comprising a plurality of sector fields, and having various pieces of information recorded in said sector fields, wherein said sector field comprises:a header field in which (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€œ1â€  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 type are recorded; and a recording field on/from which data is recorded/reproduced on the basis of the data recorded in the header field, wherein the sector type includes at least one of information indicative of a rewritable first sector, information indicative of a rewritable last sector, and information indicative of a rewritable sector before the last sector.