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12-10-2010, 04:25 PM
HD-DVD.ppt (Size: 332 KB / Downloads: 59)
The HD DVD name is derived from its origination as a high-definition extension of the DVD optical disc format.
An HD DVD disc can store substantially more data than a standard DVD, because of the shorter wavelength (405 nm) of the blue-violet laser (DVDs use a 650-nm-wavelength red laser and CDs an infrared 780 nm laser), which allows more information to be stored digitally in the same amount of physical space.
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.
The 30 GB dual-layer HD DVDs have been used on nearly every movie released in this format.
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