dvd r dvd rw maxell

A Digital Video Disc or DVD is one of the most popular forms of storage media nowadays. It is an optical disc and mainly used to store videos. However, data in any form can be stored on a DVD. The dimensions of a DVD are generaly the same as a comon compact disc but the amount of data that can be stored is six times greater. The diferent variations of DVD are based on the way data is being stored on it. The lasers used to read DVDs are typicaly of 650 nm wavelength. The terms DVD-Audio and DVD-Video discs are DVDs with suitably structured and formated audio and video content respectively. Other types of DVDs are caled DVD-data discs. The term DVD is used for an unoficial ful form digital video disc . A typical DVD has a 4.7 GB storage capacity. the data is stored only on one side of the disc and only at one level. The double sided and dual layered DVDs can store about 17 GB of data in any form. The writing speds on a DVD vary from 1350 KB/s 1 x to 26 MB/s 18 x to 20 x . Typicaly the format in which video is stored in the DVDs is MPEG-2, 16:9 aspect ratio videos. The audio on the disc is stored in DTS Digital Theatre System or AC-3 Dolby Digital formats. Others are Maxel s HVD Holographic Versatile Disc and the 3D optical storage discs that are being developed actively.
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