Differences Between CD DVD Media
media size and shape, the things they have in
common ends there. There are many different
things between the two, such as what they hold
and how much they hold.
Data pits and lasers
A disc has microscopic grooves that will move
along in a spiral around the disc. CDs and
DVDs both have these grooves, with laser breams
applied to scan these very grooves.
As you may know, digital information is represented
in ones and zeroes. Inside of these discs, very
tiny reflective bumps known as lands and non
reflective holes known as pits, which can be
found beside the grooves, reflect both the ones
and the zeroes of digital information.
By reducing the wave length of the laser to 625mm
or more infrared light, DVD technology has
managed to write in smaller pits when compared
to the standard technology of CD. This will
allow for a greater amount of data per track
on the DVD. The minimum length allowed for a
pit in a single layer DVD-R is .4 micron, which
is obviously more than the .0834 micron that a
The tracks of a DVD are narrower as well, which
allows for more tracks per disc, which also
translates into more capacity than a CD. The
avaerage single layer DVD holds 4.5 GB of data,
while a CD holds a mere 700 MB.
As stated above, a DVD has smaller pits and the
lasers need to focus on them. This is actually
achieved by using a thinner plastic substrate
than in a CD, which means that the laser needs
to pass through a thinner layer, with less
depth to reach the pits. It's this reduction in
thickness that's responsible for the discs
that were only 0.6mm thickness - which is half
that of a CD.
Data access speed
DVDs will access data at a much faster rate than
a CD can. The average 32X CD-ROM drive reads
data at 4MB a second, while a 1X DVD drive reads
at 1.38MB a second. This is even faster than
an 8X CD drive.
Universal data format
The recording formats of CDs and DVDs are quite
different, as DVDs use UDF, or the Universal
Data Format. This format allows data, video,
audio, or even a combination of all three to
be stored in a single file structure. The
advantage to this is any file can be accessed
by any drive, computer, or even consumer video.
CDs on the other hand aren't compatible with
(word count 427)
Benefits Of CD Duplication
CD Mastering Engineers
If a recording artist or inspiring musician has any hopes of having their songs played on the radio, they'll need to have their rough mix mastered very well. The best way to do this, is to hire a CD mastering engineer. Professional...
Several years ago, CD-R media and CD burners were never imagined. Computers were just reached the GHz speed, with Pentium 1 just starting to reach the horizons. Floppy disks were the ideal way to store data, even though it took several of...
Copy Like A Professional
Anyone who has burned CDs in the past has had to have encountered this problem - your CD doesn't want to play in certain CD players. You've probably tried switching to a different brand of disks, switching the writing speed of your CD...
Duplicating Within Your Budget
If you plan to produce, market, and sell your own CDs, you have the need for high quality CD duplication. If you have the need for great quality and great prices, you should thing about things before you turn to one company to do all of...
Essentials Of CDR
The simple rule of thumb is that whatever you have stored as a file on any other storage medium can also be stored as a file on a CD-ROM. To the recorder, a file is a file, and an ISO doesn't care whether or not the file contains pictures,...
How To Copy CDs
Copying CDs is something that is very popular now more than ever. When CD burners and duplication was first introduced, people caught on although it wasn't nearly as popular as it is today. These days, millions of people throughout the...
Intro To CD Mastering
Even though many assume that the mixing of the seperate audio tracks is the final step, a recording should always be mastered well in order to sound great. CD mastering is the final chance for creative input when you create a compact...
The master CD or DVD disk, is the one you will provide to your CD or DVD vendor for either replication or duplication of the media. Below, you will find some tips designed to help you create a high quality master disc: 1. Always use...
Storing Your CDs
There are many different storage alternatives for your CD collection. The factors for storage include how many CDs you own and how long you plan to keep them. Below, you will find several alternatives for storing your CDs: 1. ...
What You Should Know
With the increasing amount of CD duplication options for equipment, its very important that you read the reviews for the different types of equipment you are considering before you make that final decision and choose your model. The...
|© CDDuplication.Tdrbizl.com 2006|