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DVD Video
DVD Video also known as Digital Versatile Disc or Digital Video Disc is known to be one of the popular versions of media format also known as optical disc storage and its main purposes are storage of video and data. In fact most DVDs belong to the same dimensions as those of the compact discs or CDs but are known to have more storage space than CDs. The term DVD varies according to the usage and the way the data is stored in the DVD. DVD-ROM is known to have data that can only be read and not written while DVD-R contains data that can be written once and then it starts functioning like that of a DVD-ROM. On the other hand a DVD-RAM which is also known as DVD-RW is known to carry data which one can re-write for numerous times.

DVD-Video and DVD-Audio discs are those which are known to carry DVD-Video and DVD-Audio video content inclusive of audio content and the other varieties of DVD discs inclusive of those having video content may also be known as DVD-Data discs. At times the terminology of DVD is mostly known to be misused in order to be referred as optical disc formats with high density like those of Blu-ray and HD DVD.

The year 1993 saw the development of two optical storage standards of high-density and among them one being MultiMedia Compact Disc was known to be supported and promoted by Philips and Sony while the other one being the Super Density disc was backed by Toshiba, Time Warner, Matsushita Electric, Hitachi, Mitsubishi Electric, Pioneer, Thomson, and JVC. In the following years Philips and Sony gave up on MultiMedia Compact Disc and they fully agreed to go by Toshiba’s SuperDensity Disc which was considered among the disc having one modification only.

Originally DVD came to be used in terms of intialism applicable for digital video disc which is an unofficial terminology and in 1995 it was reported about the letters indicating towards the term of digital versatile disc. According to the reports of the newsgroup FAQ the DVD forum is known to have declared that the initials DVD stood for nothing and hence presently the usage and indication of DVD varies from person to person. The disc capacities in a DVD varies from single layer capacity to dual or double layer capacity and simultaneously the disc type also varies from DVD-R SL, DVD+R SL, DVD-R DL, and DVD+R DL.

The single sided single layer DVDs are known as DVD-5, while the DVD-9 are known as single sided, dual layer. The DVD-10 are the double sided, single layer DVDs, and double sided, dual layer on one side are known as DVD-14 and lastly the double sided, dual layer on both sides are recognized as DVD-18. DVDs are known to make use of laser diode light of 650 nm against the 780 nm light used in a CD. Initially HP was known to have developed the version of recordable DVD media to support the aspect of storing data for back up and transporting. In fact the recordable DVD are known to be utilized for audio and video recording by consumers and the 3 following formats that were developed were known as DVD-R/RW (minus/dash), DVD+R/RW (plus), DVD-RAM.

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