HD DVD [High Density DVD] - Next Generation DVD
HD DVD, High Density DVD, or High-Definition DVD is a high-density optical disc format designed for the storage of data and high-definition video.
The HD DVD disc is designed to be the successor to the standard DVD format and can store roughly 3-6 times as much data as its predecessor. Although it uses the same blue-violet 405 nm laser as Blu-ray Disc uses, technical differences make the two formats incompatible. The additional capacity of HD DVD means the discs are more suited to high-definition video than are standard DVDs. In comparison to its main competitor, Blu-ray Disc, HD DVD holds more information capacity per layer and it’s available in various sizes 15, 17, 30, 34, 45 or 51 GB. 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. And is 100% compatible with all types DVD’s and CD’s unlike Blu-Ray. HD DVD are also available in “Combo Format” DVD’s that have a DVD movie on one side and an HD DVD movie on the other. Blu Ray disk structure does permit this.
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