Patent ID: 6215759
Filing Date: 2001-04-10
Classification: G11B

Abstract:
An information recording medium comprising a plurality of concentric zones, and controlled to be rotated such that the zones are rotated at respective rotation speeds, wherein:each of the zones comprises a predetermined number of tracks, each of which comprises sector fields, such that each of the tracks in a specific zone comprises a predetermined number of sector fields which is different from the number of sector fields in the other zones, and each of the sector fields comprises:(a) a header field in which data is recorded as embossed pits, and which comprises a header 1 field, a header 2 field, a header 3 field, and a header 4 field; and(b) a recording field in which data is recorded with a phase change;each of the header 1 field, the header 2 field, the header 3 field, and the header 4 field includes (i) a first field in which a continuously repeated pattern is recorded, (ii) a second field which is provided subsequent to the first field, and in which an address mark is recorded, and (iii) a third field which is provided subsequent to the second field, and in which address data is recorded;the first field of each of the header 1 field and the header 3 field has 36 bytes;the first field of each of the header 2 field and the header 4 field has 8 bytes;the second field of each of the header 1 field, the header 2 field, the header 3 field and the header 4 field has 3 bytes;the repeated pattern recorded in the first field complies with a run length limitation in a predetermined range;the address mark recorded in the second field includes a violation pattern exceeding the run length limitation in the predetermined range; andthe violation pattern is a pattern different from a reproduced pattern obtained by reproducing the repeated pattern when a defective pit which cannot be recognized as a pit is included in pits representing the repeated pattern.