Kabushiki Kaisha Toshiba

Hideaki Osawa

Koki Tanoue

Naobumi Seo

Tamane Takahara

In an information recording medium including a plurality of sector fields and having various pieces of information recorded in the sector fields, the header field in each sector field includes a first field in which a continuously repeated pattern complying with the run length limitation in the predetermined range is recorded, a second field in which an address mark including a violation 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 is recorded, the violation pattern exceeding the run length limitation in the predetermined range, and a third field in which address data is recorded.

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 data recording/reproducing optical disk comprises a plurality of land areas and a plurality of groove areas, which are formed in configuration as concentric circles in such a manner that a plurality of tracks are formed on the plurality of land areas and the plurality of groove areas, the plurality of tracks are partitioned into a plurality of zones provided on the disk from the inner side to the outer side thereof and a plurality of sector areas are formed on a track in a continuous manner with the plurality of sector areas on a next track, wherein the disk in use is rotated such that a rotation number of the disk in a zone is sequentially slowed in successive zones toward the outer side of the disk along a radial direction under a condition of a constant product of a rotation number and the number of sector areas in one track in each zone.

Optical disk, and method apparatus for recording/reproducing data thereon wherein areas of the disk employ different formats

A recording/reproducing optical disk of the present invention comprises a first recording section formed on a spiral track in an area in the shape of a land, a second recording section formed on the spiral track in an area in the shape of a groove, the second recording section being adjacent to the first recording section, a first half header section in which first address information of the first recording section is recorded, and a second half header section, in which second address information of the second recording section is recorded, and which is disposed in pair with the first half header section in a zig-zag shifted manner, wherein the first half header section and the second half header section are located ahead of the first recording section to assume a first positional relation relatively to the first recording section and the first half header section and the second half header section are located ahead of the second recording section to assume a second positional relation other than the first positional relation relatively to the second recording section.

Recording/reproducing optical disk with zig-zag shift headers and recording/reproducing apparatus using same

Recording/reproducing optical disk with constant product of rotation number and number of sector areas and recording/reproducing apparatus using same

Information recording medium with address marks (AM) for error detection, cutting apparatus for manufacturing the information recording medium, and information reproducing apparatus for reproducing the information recording medium

A plurality of land sectors are arranged along a first spiral track, and at the header portion of the land sector directly before the first sector among the plural land sectors, information indicating that this sector is directly before the first sector with its address information, and a plurality of groove sectors are arranged along a second spiral track adjacent to the first spiral track, and at the header portion of the groove sector directly before the first sector among the plural groove sectors, information indicating that this sector is directly before the first sector with its address information, thereby forming a structure for switching the land sector and the groove sector successively and alternately every spiral track, with the header portions of the land sector and the groove sector making a pair to be arranged in a staggered pattern.

Optical recording disk having land and groove continuously alternated in spiral tracks

Information is recorded/reproduced on/from an information recording medium in units of sectors each having a preformatted header field and a recording field using a change in optical characteristics due to a phase change. The recording field includes an actual recording field rewritably records information, and a gap field arranged before the actual recording field, having a length set on the basis of a random number, and having no information. The recording start position of the actual recording field is set at random. A guard field recording dummy data and having a length set on the basis of a random number is formed next to the gap field. Start portion degradation in the recording layer due to overwrite is generated only in the guard field.

Optical information recording medium and information recording method

A reproducing apparatus which reproduces data recorded on an information recording medium. The reproducing apparatus is provided with a header field and a recording field. A synchronization code and address data are recorded in the header field. The reproducing apparatus generates a slice level signal based on a reproduce signal of the synchronization code obtained from the header field of the information recording medium. The reproducing apparatus reproduces the address data obtained from the header field by binarizing it based on the slice level signal.

Reproducing apparatus by generating slice level at header field of the

A first-half header portion constituted by a first header portion whose VFO portion as long repeated data is arranged at the start and a second header portion whose VFO portion as short repeated data is arranged at the start is used as the header portion of each of land sectors arranged in a predetermined number along a spiral track. A second-half header portion constituted by a third header portion whose VFO portion as long repeated data is arranged at the start and a fourth header portion whose VFO portion as short repeated data is arranged at the start is used as the header portion of each of groove sectors arranged in a predetermined number along a spiral track. These land and groove sectors are continuously alternated in units of spiral tracks.

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Yokohama, Japan

Hideaki Osawa