The CD was first introduced into the world by Phillips
and the Sony corporation and was to replace the
LP.It started rather badly but in 1995 there was a
standard being set for the dvd.
Cdrom have been around awhile,but as the world
grows,so do technology.And we have ended up
with a much bigger format called the DVD which
stands for Digital Versatile Disk.
This is a high capacity cd size disc basically for
multimedia applications.This high quality video
and audio format may replace the VHS altogether.
The DVD started as the Digital
Video Disc and
some technicians may still refer the the disk with
this name.DVD discs offer much higher capacity
than CDs for high quality video,audio and software.
The new DVD
use the same format as the CDROM .
Cdroms are great formats for recording data but the
DVD is best for recording large applications like
movies.And they are fast becoming the best choice
for storage and computer backup.
The DVD for store up to 17.1 gigabytes of data whereas
the cdrom can store up to 700 megabytes.Thats quiet
a difference in storage space.
THE TYPES OF DVD DRIVES
Early DVD drives were all dvd-rw compatible made by
the dvd forum,a group of manufacturers that started
the dvd format together.
The first DVD+RW drives
had no capability to write -once
DVD media.However,in 2002 Verbatim became the first
media maker to offer DVD+RW technology in both the
ReWritable and Write-once formats,alright already.
Around In October 2003, Philips and Mitsubishi displayed
the new dual-layer DVD
recordable technology. The new
technology virtually doubles data storage capacity on
DVD+R recordable discs from 4.7GB to 8.5GB, while
remaining compatible with existing DVD Video players
and DVD-ROM drives.
DVD Multi-compliant drives, provide read/write support for
all DVD recordable DVD specifications with theDVD-RAM,
DVD-R and DVD-RW as well as read/write support for
CD-R and CD-RW media.
When the dvd format started there were different versions
and there was no guarantee that your recording from
one dvd writer would play on another player.
To add to the versions,the DVD-RAM
lets you erase
specific files and add new ones.You could also write
to the dvd up to 1000,000 times became any data
degration may occur.
The dvd-rw will only allow you to write to the disk just
1,000 times before data degradation.And the new
DVD-Audio format was developed for music and
other audio files.
Talk about mass confusion concerning the dvd.While
you may not be concerned at all about the technical
side of the dvd,it may be to your advantage to learn
the basics.Be sure your dvd player and writer will
support all format of the dvd.
FEATURES OF THE DIGITAL VERSATILE DISC
The DVD has the same physical dimemsions as
the compact disc but is made slightly different.Most DVD
hardware will play audio CDs and CDROMs.The average dvd drive is secured
in the computer with retaining
screws but most use drive rails to firmly secure the drive
to the system unit.
The cdrom and dvd drives can share the same Controller
which communicates with the computer.The controller
is motherboard mounted on new computers.But older
systems had some
controllers inserted into an adapter
slot at the rear of the system unit.
All formats of the dvd use a common file system
named UDF.The DVD come in both recordable and
re-writable versions.Let's briefly mention the different
formats of the dvd.
The DVD ROM
has the read-only format supporting
discs with capacities of from 4.7GB to 17GB and
access rates of 600 KBps to 1.3 MBps. Backward-
compatible with CD-ROMs.
DVD Video is used for displaying full-length digital movies.
DVD-Video players televisions like videocassette players.
The Digital-Video format includes a Content Scrambling
System (CSS) to prevent users from copying discs.
The DVD audio store audio similar to the CD-Audio
format. DVD-Audio is facing stiff competition from a
number of other high fidelity audio standards.
The DVD Recordable Disc use the write-once DVD
format. DVD-R discs are the DVD counterpart to
CD-R discs.The DVD Drive can be installed along
side the CDROM Drive and they both share the same
Ribbon cable.The
cable connections in the rear of
both drive are the same.
The DVDRAM use a rewritable compact disc format that
provides much greater data storage than today's CD-RW
systems. The caddy-mounted discs will initially provide
2.6GB per side on single or double-sided discs.
DVD is the new generation of optical disc storage
technology. This is bigger and faster than the CD. DVD
aims to encompass home entertainment, computers,
and business information with a single digital format.
It has replaced laserdisc, is well on the way to replacing
videotape and video game cartridges, and could eventually
replace audio CD and CD-ROM. And now the DVD has
widespread support from all major electronics companies.
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Article by: Otis F. Cooper
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Copyright 2002 Otis F. Cooper
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