,
http://www.pioneerelectronics.com/PUSA/
and was the first format compatible with stand alone DVD players. The group
that promotes the technology calls itself the DVD Forum
, which is “an international
association of hardware manufacturers, software firms, content providers,
and other users” with notable members such as Hitachi, Samsung, and Toshiba.
The DVD-R/-RW format is based on CD-RW technology and uses a similar
approach to burning discs.
http://www.geeks.com/techtips/2004/Images/DVD3.gif
The DVD+R/+RW format is a newer format, also based on CD-RW technology, and
compatible with a large percentage of stand alone DVD players. The +R/+RW
technology is not supported by the DVD Forum, and its main backing comes
from a group called the DVD+RW Alliance .
http://www.geeks.com/techtips/2004/techtips-29dec04.htm
The Alliance “is a voluntary group of industry-leading personal computing
manufacturers, optical storage and electronics manufacturers” with members
such as Dell, Hewlett Packard, Sony, and Phillips Electronics.
http://www.geeks.com/techtips/2004/Images/DVD4.gif
The DVD-RAM format is based on PD-RW (Phase-Differential) drives, and
actually uses a cartridge to hold the media (just like its PD-RW
predecessor). Some DVD-RAM cartridges are double sided, making them ideal
for companies to use as system backup, hence DVD-RAM is usually found only
in commercial applications, and most end-users won’t ever need to use or see
this type of drive. The DVD-RAM standard is also supported by the DVD Forum
just like the DVD-R/RW format. However, because of its use of a cartridge
(limiting it’s compatibility), and the scarcity and price of the media used,
DVD-RAM is a distant third when compared to the DVD+R/+RW and DVD-R/–RW
technology.
The +R/+RW and –R/-RW formats are similar, and the main difference DVD+R
technology has is the ability to record to multiple layers (with its new
DVD+R DL format), where DVD-R can only record to one layer (not all +R
drives are capable of dual layer burning, but no -R drives are). The Plextor
PX-504U
http://www.geeks.com/details.asp?invtid=PX-504UF-SW-R
&cat=DVD
is an example of an external DVD+R/+RW drive capable of recording single
layer discs in the +R/+RW format, but also able to read discs recorded by a
DVD-R drive.
What is DVD±RW?
DVD±RW is not actually a separate format, but the designation given to
drives capable of both –R/–RW and +R/+RW operation. This type of drive is
typically called a “Dual Drive” (not to be confused with a “Double Layer”
drive) since it can write to both the +R/+RW and –R/–RW formats. The Samsung
TS-H552
is a DVD±RW drive capable of reading and writing every format discussed
http://www.geeks.com/details.asp?invtid=TS-H552-BLK-BULK-N
&cat=DVD
so far, and then some. It takes advantage of DVD+R DL (Double Layer)
technology available with the +R format, allowing the appropriate media to
store virtually double the 4.37 GB capacity of a typical single layer disc.
The other main thing to consider with DVD burners is selecting the correct
media. Media for DVD-R
, DVD-RW,
http://www.geeks.com/details.asp?invtid=DVD-R16X-25-25
DVD+R
http://www.geeks.com/details.asp?invtid=DVDPLUSR8X-50-50
&cat=MED
and DVD+RW media may all look the same, but they are slightly different in
order to match the specific recording formats. The price of media for either
format is generally the same, with RW media costing a good deal more than R
media of either format. Double Layer media is even more expensive, and is
the only way for an owner of DVD+R DL drive to take advantage of the
tremendous capacity increase. As the amount of Double Layer drives increase
in the market, the price of the DVD+R DL media is expected to fall with
increased production of the media. DVD Burners (as these drive are often
referred to) can be picky about the media supported, so be sure to choose
your media wisely.
DVD in a Nutshell
· DVD-ROM : Reads DVD discs
· DVD+R : Writes to DVD+R media (will also typically write to CD-R
and CD-RW media)
· DVD+RW : Writes to DVD+RW media (will also typically write to
DVD+R, CD-R and CD-RW media)
· DVD+R DL : Writes to DVD+R DL (Double Layer) media (will also
typically write to DVD+R, DVD+RW, CD-R and CD-RW media; many Double Layer
drives are ALSO dual drives – that is, able to write to BOTH +R/RW and –R/RW
media)
· DVD-RAM : Writes to DVD-RAM cartridges (not in wide use on
consumer market – mainly a business format; can also read PD-RW discs. Will
not usually be able to write to any other format including CD-R or CD-RW)
· DVD-R : Writes to DVD-R media (will also typically write to CD-R
and CD-RW media)
· DVD-RW : Writes to DVD-RW media (will also typically write to
DVD-R, CD-R and CD-RW media)
· DVD±RW : Writes to DVD-RW and DVD+RW media (will also typically
write to DVD-R, DVD+R, CD-R and CD-RW media; typically called “Dual Drives”
since it can burn to two different DVD formats)
Final Words
This article took a look at the more common formats of DVD drives in order
to shed some light on all the choices available. The differences between
them all may be subtle, but the compatibility issues can be quite
frustrating. The simple answer to anyone considering a drive is to forget
about + and – by themselves, and shoot for universal compatibility with a
good DVD±RW with DVD+R DL support.]]>
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