Martin DiViaio on Mon, 7 Jul 2003 15:06:06 -0400

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Re: [PLUG] 7.9 G DVD-R's?

Comparing commercial DVDs to DVD writable/rewritables is like comparing
apples and oranges. They are not the same. A commercial DVD has a maximum
theoretical capacity of 17GB. That's two-sided, two layers per side.
DVD-R only has a maximum capacity of 4.9GB (or is it 4.6, I forget off
hand). As far as I know, DVD-R can not be double sided at this time. The
standard(s) are still in flux; so that may change in the future. (Don't 
count on it.)

DVDs generally use the MPEG-2 compression algorithms to fit the data on to 
the DVD. Converting to MPEG-4 or DiVX MIGHT make the data small enough to 
fit on a standard DVD-R. In fact, a friend took a DVD movie and converted 
it to DiVX. The end result was fit on to 2 standard CD-Rs. YMMV.

The issue of encryption/decryption. DeCSS (and it's resulting lawsuit)
proved two things. Decryption of the DVD is fairly easy and it's not
necessary to decrypt the DVD to copy it. If you want to do anything else
(i.e. view it, convert it to a different MPEG format, etc..)  you need to
decrypt it.

Lastly, let's not forget the legal ramifications. According to the 
(infamous) DMCA, it's illegal to make a copy of any "copy protected" media 
for any purpose without the express permission of the copyright holder. 
This includes backups. There are exceptions to this but none of them apply 
to personal use.

On the 7th day of July in the year 2003 you wrote:

> Date: Mon, 7 Jul 2003 11:25:25 -0400
> From: Stephen Gran <>
> To: PLUG <>
> Subject: [PLUG] 7.9 G DVD-R's?
> Oh and next question for the group - does anyone have any experience
> with copying dvd's?  It looks like all my commercial ones are 7.9g, and
> the only dvd-r's I see for sale are 4.7g.  I guess what I'm looking for
> is people's experience ripping them - I have tried `mkisofs --dvd-video`
> without a huge amount of success, dd with a little more - and then
> suggestions as to where to get hold of 7.9g dvd -r's.
> Also, is the single/double sided issue?  Can this be managed by most dvd
> burners, or do you need a special one capable of burning to both sides?
> Sorry for the totally newb questions, but a lot fo this stuff is fairly
> new to me.  Just when I had the vcd thing all figured out, somebody went
> and gave me a dvd burner, and I have to start all over :)
> Thanks in advance,

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