 | |
| Media type: | High-density optical disc |
|---|---|
| Encoding: | VC-1, H.264, and MPEG-2 |
| Capacity: | 15 GB (single layer) 30 GB (dual layer) 51 GB (triple layer) [1] |
| Read mechanism: | 1x@36 Mbit/s & 2x@72 Mbit/s |
| Developed by: | DVD Forum |
| Usage: | Data storage, including high-definition video |
HD DVD or High-Definition DVD is a high-density optical disc format designed for the storage of data and high-definition video.
Overview
HD DVD is designed to be the successor to the standard DVD format and is derived from the same underlying technologies. Since all variants except the 3x DVD employ a blue laser with a shorter wavelength, it can store about 3 1/2 times as much data per layer as its predecessor (maximum capacity: 17 GB instead of 4.7 GB per layer). A 51 GB triple-layer spec has been approved, however no movies are currently scheduled for this disc type.[2]
HD DVD is currently in a "format war" with rival format Blu-ray Disc, to determine which of the two formats will become the leading carrier for high-definition content to consumers.
As of November 27, 2007, 344 HD DVD titles have been released in the USA.[3] As of September 15, 2007, 133 HD DVD titles have been released in Japan, with 21 titles pending to be released.[4]
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