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DVD Formats Explained

Posted on Friday, January 05 2007 @ 05:58:07 CET by


The name Blu-ray Disc is derived from the blue-violet laser used to read and write this type of disc. Because of this shorter wavelength (405 nm), substantially more data can be stored on a Blu-ray Disc than on the common DVD format, which uses a red, 650 nm laser. In comparison to HD DVD, which also uses a blue laser, Blu-ray Disc has more information capacity per layer (currently 25 GB, but test media is up to 33 GB). Several manufacturers have released 50 GB recordable BDs and rewritable discs. All supporting studios have either already released or have announced release of movies on 50GB discs.

In comparison to its main competitor, Blu-ray Disc, HD DVD has less information capacity per layer (15 gigabytes instead of Blu-ray Disc's 25). HD DVD shares the same basic disc structure as a standard DVD: back-to-back bonding of two 0.6 mm thick, 120 mm diameter substrates.

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