Hideaki Osawa

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

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

Reproducing apparatus by generating slice level at header field of the optical disk

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

Optical information recording medium and information recording method

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

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

Track-accessing controller for optical disks

Information recording medium, cutting apparatus, and information reproducing apparatus

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