DVD Region 2 - E.T. The Extra-Terrestrial: Collectors Edition (3 Disc Set)) - Video & DVD

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1. DVD is an optical disc storage media format that can be used for data storage, including movies with high video and sound quality. DVDs resemble compact discs: their physical dimensions are the same—12cm or the mini 8cm—but they are encoded in a different format and at a much higher density. DVDs contain a file system, called UDF, which is an extension of the ISO 9660 Standard used for CD-ROMs.

2. The information on a standard CD is encoded as a spiral track of pits moulded into the top of the polycarbonate layer (The areas between pits are known as lands). Each pit is approximately 125 nm deep by 500 nm wide, and varies from 850 nm to 3.5 µm long. The spacing between the tracks is 1.6 µm. To grasp the scale of the pits and land of a CD, if the disc is enlarged to the size of a stadium, a pit would be approximately the size of a grain of sand. The spiral begins at the center of the disc and proceeds outwards to the edge, which allows the different size formats available.