Kabushiki Kaisha Toshiba

Toshiba Samsung Storage Technology Corporation

Tatsuro Shimizu

Hiroshi Nakane

Shigeo Tsuchiya

An optical disc device includes a recording section which records recording information in an optical disk, a reproducing section to reproduce the information recorded in the optical disk, a storage section which stores information Po&#x2212;n to Po+n or Pb&#x2212;n to Pb+n of a preceding or succeeding position Po&#xb1;n or Pb&#xb1;n while a recording start position Po or a recording interrupt position Pb is defined as a reference, the information being reproduced by the reproducing section, when recording of the recording information is started or recording is restarted after the recording has been interrupted, and processing section which comparing reproduction information obtained by reproducing the information Po&#x2212;n to Po+n or Pb&#x2212;n to Pb+n again, cache information stored in the storage section, and the recording information, and then, determining whether or not recording has been normally performed on the optical disk when recording of the recording information terminates or is interrupted.

Optical disc device and recording method

An optical disk has a reflecting layer and a transparent substrate formed on the reflecting layer. The type of the optical disk changes depending on the physical characteristics of the reflecting layer and the thickness of the transparent substrate. When discriminating such a disk, an objective lens which focuses an optical beam on the disk is moved toward the disk. Along with this movement, a detection signal that detects an optical beam reflected by the disk generates a detection signal. First, a peak accompanying mirror surface reflection of the surface of the disk appears, and then a peak accompanying reflection of the reflecting layer appears. The type of the disk which concerns the transparent substrate of the optical disk is discriminated from the time interval between the two peaks. The characteristics and reflection level of the RF component of detection signal generated by the detector change in accordance with the count of reflecting layers and the reflectance of the reflecting layer(s). This discriminates the physical characteristics of the reflecting surface and the type of the optical disk. In this manner, with the disk type discrimination method and device according to the present invention, discrimination can be performed within a substantially constant, short period of time after the disk is set in the device until the disk is recognized.

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Yokohama, Japan

Tatsuro Shimizu