Car CD Player Systems
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 best CD duplication equipment for your project
will all depend on the volume of CDs you plan to
duplicate at a time, and the amount of money that
you are planning to invest on a particular piece of
equipment.
Your best source for reading reviews of CD duplication
equipment is on the Internet. There are many
different consumer websites out there that will allow
users to post reviews of equipment, then rate them
on a five or ten point scale. Anytime you are
reading reviews, it's very important that you get
your information from a trusted and reliable source.
Websites that are up by the owner of the product, or
those that are trying to sell you specific hardware
normally aren't the best to turn to when you need to
read a review. No one who is trying to get you to
buy a certain piece of hardware is going to tell
you about the flaws the equipment has, or even let
you know about a competitor who has a similiar item
for sale at half the price.
Enjoy - DT.
CD Systems for Cars Boats Planes
Car CD and DVD Info... |
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Differences Between CD DVD Media
Even though both CD and DVD disks have the same
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
CD offers.
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.
Layers
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
this format.
Enjoy - DT.
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