How DVD´s and DVD Players work

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How DVDs and DVD Players Work Nearly every movie produced today is available on DVD, and many older movies are being moved to the DVD format. Often, a movie comes out on DVD before it comes out on video tape, because the manufacturing and distribution costs for DVDs are so much lower A DVD is very similar to a CD, but it has a much larger data capacity. A standard DVD holds about seven times more data than a CD does. This huge capacity means that a DVD has enough room to store a full-length, MPEG-2-encoded movie, as well as a lot of other information. Here are the typical contents of a DVD movie: Up to 133 minutes of high-resolution video, 720 dots of horizontal resolution Soundtrack presented in up to eight languages using 5.1 channel Dolby digital surround sound Subtitles in up to 32 languages DVD can also be used to store almost eight hours of CD-quality music per side. Storing Data on a DVDDVDs are of the same diameter and thickness as CDs, and they are made using some of the same materials and manufacturing methods. Like a CD, the data on a DVD is encoded in the form of small pits and bumps in the track of the disc. A DVD is composed of several layers of plastic, totalling about 1.2 millimetres thick. Each layer is created by injection moulding polycarbonate plastic. This process forms a disc that has microscopic bumps arranged as a single, continuous and extremely long spiral track of data. Once the clear pieces of polycarbonate are formed, a thin reflective layer is ...

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