DVD-ROM

DVD-ROM (abbreviation of the English term Changeable DIGITAL Disc Read Only Memory ) is a DVD which can be reached only in reading.

History and characteristics

Support DVD was developed by several large companies of the field of multi-media, the groups Toshiba - Time Warner and Philips - Sony. It appeared in September 1995.

The DVD-ROM resembles like two water drops CD-ROM, but it profits from a density of definitely higher writing which enables him to lay out of a storage capacity of data at least seven times higher.

It makes it possible to store any type of information: data, vidéos and musics.

Lifespan

According to the manufacturers, it varies between 40 and 250 years. However, the experiment with its predecessor, CD-ROM, makes think that the lifespan would range rather between 3 and 25 years.

Conditions of lifespan

To maximize the lifespan of a DVD-ROM, it is necessary to expose it the least possible to the rays Ultra-violet S, to maintain it with an average temperature 15°C and to expose it to a controlled hygroscopy which is at approximately 35 %.

The virgin DVD-ROM are degraded more quickly before being engraved, from where the interest not to keep them too a long time before using them.

A slow speed of engraving is also pledge of a better lifespan for a DVD-ROM.

Wear

The successive readings add to the wear of this support, but they are especially the shocks generated during the readings (readers transportable or reader of car) which play a paramount role in the wear of the DVD-ROM.

Quality of the support

The quality of the support between as in account, the layer containing the data appears most important (the Metal-azo seems more perfomant as the Cyanine) but the layers of varnish are also to take into account.

Certain reader-engravers of DVD have now technology SolidBurn, a process created by Philips so that the peripheral determines best possible speed of engraving according to the quality of the support. This was possible before only by the integration of data at the time of construction, in the engraver, which made impossible the identification of a form of mediums not indexed.

The DVD-R are less fragile than the DVD-RW which, them, are credited one lifespan of 25 and 100 years by the manufacturers.

One should not especially mix two incinuents terms latent technology of the DVD. The pluractivity of the DVD Blue Ray opposite its British counterpart makes of it the point of test card of the nanotechnology.

Francization of term DVD-ROM

The term dévédérom is the nonofficial Francization (i.e. she is not proposed by the French Academy) of the Acronyme DVD-ROM . This word comes simply from the reading Phonétique of the Sigle English, by analogy with the term cédérom resulting from CD-ROM .

On its side, the Québécois Office of the French language standardized term DVD-ROM in 2002. It disadvises the C-Ws communication dévédérom or dévédé and its forms derived ( dévédévidéo , dévédéaudio , dévédé-r , dévédé-rw , dévédéram , etc), from use “more whimsical than useful” and being likely “to increase confusion. ”

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