19-03-2014, 04:45 PM
DVD TECHNOLOGY
DVD TECHNOLOGY.ppt (Size: 1.03 MB / Downloads: 14)
Introduction
You have seen people watching different kind of movie on their laptops.But one thing which may helps them to do so is a DVD.
So first of all let us know what this DVD is?
It is a
Digital Versatile Disc.
A high-capacity compact disc. This disc can store enough data for a full length movie. You must have a DVD disc drive or player to use DVD discs.
History
Before The Release of Dvd in 1995,Video Cd (VCD) became the first format for distributing digitally encoded films.Before this CD Video used analog video encoding.VCD was in the market in 1993.In the same year two new optical disc storage formats were being developed one was Multimedia CD(MMCD) and the other was Super Density(SD) disc.
DVD Application Formats
DVD-R
Write-once type DVD-Recordable discs invented by Pioneer in 1998. This technology is used for master-disks recording.
DVD-ROM
DVD Read Only Memory. DVD-ROM is a version of DVD for computers, designed to replace the CD-ROM. It has the same capacity as DVD-Video that is far greater than normal CD-ROMs.
DVD-RAM
DVD-Random Access Memory. Rewritable type with disadvantage of the backward compatibility, i.e. DVD-ROM drives and DVD players cannot read from DVD-RAM media.
DVD-RW
DVD-Rewritable. This format was partially compatible with modern DVD players and DVD-ROM drives. Can be used only for recording audio and video streams.
Advantage
DVD is a storage device which can store very large amount of date than CD as it can store on both side.
Cost of DVD is just a little more than other storage device but it gives many times more storage capacity showing its cost effectiveness.
It can be used as the efficient backup media for its above qualities.
Disadvantage
Not fully supported by HDTV .For that HD-DVD is required which is more costly.
There is a necessity of DVD drives to use DVD as it is not supported by CD drives. Even DVD-ROMs cannot be played on DVD-Video players, but only on DVD-ROM drives.
In built Copy protection .