corporations such as SONY and Matsushita Electric Industrial Co., Ltd. decided jointly, it rewrites, the possible bulk phase changeoptical disk. The capacity whichexceedscurrent DVD is actualized oneof standard of generally known"next generation DVD ". The next generation DVD "HD DVD "standardand the integrationof specification which Toshiba and the like lectures were examined, but you did not come to terms, also both systems came to the point of with being utilized.

As CDand DVD with the form which receivesthe optical diskof the same diameter 12cm to the cartridge, as for record capacity maximum 27GB, as for data transfer rate 36Mbps. Track pitch to 0.32 µ m it becomes approximately half of DVD, it reducesshortestpitlength respectively to approximately 0.14 µ m by adoptingthe royal purple laser whose wave length is short, raises recording density.

With the standard which supposes the image record use for national welfare mainly, serial number is recorded tothe diskmountingthe copyrightprotective function in mind. As for image recording type MPEG-2 is planned. Besides the fact that several corporations examine the adoption with the video recorder and the like,the employment withof next generation game machine "placet Shaun 3 "of the SONY computer entertainment has been decided.