The DVD forum standard it is in the midst of deciding,the nextgeneration optical disk which is substituted toDVD. Toshibaa ndNEC being center, development to be advanced, as for memory capacity being maximum, 40GB.
Similarto CD DVD,the disk of the resin make of diameter 12cm is used in the media, 2typesof read-onlymediaand rewriting possible media are stipulated.
The memory capacity of DVD approximately they were 5 - 10GB with 1, but with AOD, and with read-only type at single sided monolayer 15GB and 2 layer with 30GB and rewriting possible type becomes 40GB at single sided monolayer 20GB and 2 layer. As for transfer rate 36Mbps.
In theoptical diskof record type, the rising part (land) which was put to the groove (groove) in order to induce laser light and the groove and the groove is cut in circumferential condition. When with AOD, having become the eddying condition the land and the groove like the respective mosquito taking incense stick, paralleling to just the groove, it records from the inside perimeter to outer circle and goes to the end of the groove, it has reached the point where the scan that this time just the land records from the inside perimeter to outer circle, is done. ... The continuation is read
AOD is the schedule whichbecomes the standard where the DVD forum promotes, but SONY and Matsushita Electric Industrial Co., Ltd. etc. separately from this have propelled "Blu-ray Disc"asan individual next generation optical disk, it may be avoided there is no separation state of standard.
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