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DVDs & Movies

DVD, HD DVD & Blu-ray

DVD, HD DVD & Blu-ray Article

Blu-ray Disc is a high-density optical disc format for the storage of digital information, including high-definition video.

The name Blu-ray Disc is derived from the blue-violet laser used to read and write this type of disc. Because of its shorter wavelength (405 nm), substantially more data can be stored on a Blu-ray Disc than on the DVD format, which uses a red (650 nm) laser. A single layer Blu-ray Disc can store 25 gigabytes (GB), over five times the size of a single layer DVD at 4.7 GB. A dual layer Blu-ray Disc can store 50 GB, almost six times the size of a dual layer DVD at 8.5 GB.


HD DVD or High-Definition DVD is a high-density optical disc format designed for the storage of data and high-definition video.

It 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.

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.



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