Future Data storage medias

DVD-RAM is a disc specification presented in1996. which specifies rewritable DVD-RAM media and the appropriate DVD writers. DVD-RAM media have been used in computers as well as camcorders since 1998. The direct successor of this format will be HD dvd-ram.

HD DVD-RAM

hd dvd-ram is the proposed successor to DVD-RAM for random access on optical media using phase-change principals. HD DVD-RAM will hold 20 gigabytes per layer instead of 15 gigabytes for HD DVD-RAM-r because of differences in recording methods used, yielding a higher density disc.

HD DVD-R

is the writable disc variant of HD-DVD and is available with a single-layer capacity of 15GB or dual-layer capacity of 30GB. Currently, HD DVD-R has slower write speeds than the competing BD-Rformat (1–2x vs 1–4x) and lower storage capacity.

Pricing of HD DVD devices and blank media is yet to be released (September, 2006), but it is expected that devices will be available at a lower price-point than the competing Blu-ray Disc format.

Blue-ray disk

A Blu-ray Disc (also called BD) is a high-density optical disk format for the storage of digital media, including high definition video.

* About 9 hours of high-definition (HD) video can be stored on a 50 GB disc.
* About 23 hours of standard-definition (SD) video can be stored on a 50 GB disc.
* On average, a single-layer disc can hold a High Definition feature of 135 minutes using MPEG-2, with additional room for 2 hours of bonus material in standard definition quality. A dual layer disc will extend this number up to 3 hours in HD quality and 9 hours of SD bonus material.