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- Posted on
April 12, 2005, 8:09 am
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The basic difference is capacity. A CD has about 650-700 Mb, and a
single-layer DVD can store 4.7 Gb. There are standards for storing
video on both types of discs, but I'm unaware of any audio format for
DVD discs -- outside of recording a movie without much (or any perhaps)
4.7 Gb for singe-layer discs, which now cost less than $1 a piece --
more like $0.35 a piece if you buy in bulk.
8.5 Gb for dual-layer discs, which are disproportionately expensive --
around $5-$6 a piece.
Even though dual-layer discs do not seem cost effective now, it's worth
purchasing a writer that can utilize them, as they will likely come down
No you can back up data and create video CD disks -VCDs and SCVDs.
Also you can copy apps and games to them.
You can also create picture disks.
You need a DVD writer for that. In fact you dont see too many CD
burner sales anymore. DVD writers can write to CDrs and DVDs so
everyone pretty much gets those nowadays.
There are DVD-Audio disks. I dont think anyone has broken the copy
protection to them though.
There are several high resolution audio formats SACD and DVD-A that
most DVD players can play nowadays but they havent caught on like CD
audio. Sales are dismal so the music industry which had a great sales
boost from people rebuying their music collection switching from LPs
vinyl to CDs didnt see the samething with DVD-A and SACD.
The music industry is now pushing dual disks CD on one side DVD on the
other hoping that will revive the industry.
Theres also other formats like HDCD. Optorite DVD burners and a few
others had a 1 gig format for CDs that never caught on .
Most people use DVDs to back up data and copy movies.
Yeah . The only thing holding DVD writing back was price - the price
of DVD blanks and the writer. Both have fallen . You can often get
excellent DVD writers for $50 like the NEC at Newegg.com and blank
DVDs are now so cheap they rival CDs mainly because the price of CDs
have actually gone up a little and DVDs have fallen like crazy so the
prices have converged. As mass producers of CDs switched production
to DVDs , the really insane free after rebate sales every week for CD
blanks disappeared so now the best price for CDs is around $10 for 100
during a sale. But now you can often get cheap DVD media $20-30 for
100 blanks and they hold far more data so per gig of data the DVDs are
a much better deal.
Just think of backing up your data --- tapes have really gotten
unpopular now for the avg consumer (I must have spent $500 on tapes
when I had my Iomega tape backup) and try backing up even a moderate
sized HD 100 gigs with CDrs . Even DVDs would be a hassle but you
can do a selective backup in a reasonable manner with DVDs.
Actually I think most are using hard disks now since they are so cheap
and fast. Im virtually tempted to buy a hard disk every month the
deals are so good nowadays.
Here is what you can have and what you can do with each one of them (Main
CD - CD Player only - about $20
CDR - CD burner - about $30
DVD - DVD player only (It can play CD and CDR diks too) - about $30
DVDR - DVD burner (It can burn both CDR and DVDR) - about $80, for dual
There are several recording formats disks:
CDR, DVDR - write once, read many
CDRW, DVDRW - write many, read many. You can wipe them off and rewrite on
them. They cost more, and are slower.
For DVDR/RW disks there are + and - ones. They are not much of a difference.
Some say the + is better some say the - is. 95% of home DVD players will
read the - ones, and about 90% will read the + ones. Most DVD burners can
write both formats.
After recording a CDR and DVDR are basicaly identical to a CD and DVD.
What can you put on each of them:
CD - music (Audio disk, for listining in a CD player), data (Any kind of
data - files, photos, mp3 files, games...), VCD/SVCD (VideoCD movie format)
DVD - movies (DVD movie format), data (Any kind of data - files, photos, mp3
Here is the capacity of each one:
CD - 650MB-900MB. The standard is 650MB. Most CDR disks sold today are
700MB. You can get a 900MB disks too, but the burner must support
OverBurning option. Not all CD readers can handle this too.
DVD - 4.7GB for single side disks, and 8.5GB for double side disks.
The best buy will be a DVD double sided burner. most of the new burners are