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A DVD is a high-density compact disk for storing large amounts of data, especially high-resolution audio-visual material. There are various types of DVD's. Standard Definition Movie DVDs are a movie format which uses MPEG-2 compression to provide approximately two hours of video per side at standard definition TV resolution. When most people mention the word "DVD," they are probably referring to a DVD video disc. Blu-ray and HD DVD are two competing formats that have enough storage for two hour high-definition movies. In computers, a DVD-ROM is like a larger CD-ROM that holds data and interactive audio and video material, whereas a DVD-RAM is a rewritable DVD that functions like a removable hard disk. DVD-RAM media can be rewritten 100,000 times before it is no longer usable.
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