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Date: Thu, 23 Oct 2008 09:52:57 +0200
From: Polytropon <freebsd@edvax.de>
To: "John L. Templer" <green_tiger@comcast.net>
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Cc: freebsd-questions@freebsd.org
Subject: Re: Extract Songs from DVD
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On Thu, 23 Oct 2008 02:35:25 -0400, "John L. Templer" <green_tiger@comcast.net> wrote:
> Polytropon wrote:
> > 	% dd if=/dev/acd0t01 of=track01.cdr bs=2352
> 
> Very cool!  I have a few questions though.  I notice this doesn't work
> for my Plextor CD writer.

What, dd doesn't work from Plextor writer? I had (or, still have)
a Plextor CD writer which is SCSI, so I just have to change the
command in order to read from the correct device, which is /dev/cd0
for the first SCSI CD drive:

	% dd if=/dev/cd0t01 of=track01.cdr bs=2352

Of course, you would have to change other commands in order to get
this correct, for example:

	% cdcontrol -f /dev/cd0 info



> I assume this is because CD and DVD drives
> have different drivers?

Maybe, but I think these basic things rely on the same commands
internally.



> Also, does this use libparanoia or something
> similar to extract "recalcitrant" tracks?

No, dd reads block-wise. There's dd_rescue which is able to read
from defectively manufactured media (we call them "Un-CDs" or
"Un-DVDs" in Germany).

Another option, by the way, is to use cdrdao. It has the read
command in combination with a paranoia level switch which can be
adjusted in order to read mentioned media. As far as I remember,
you need to have the atapicam facility in your kernel (custom
compile kernel or module) in order to access ATAPI devices just
like SCSI devices.

	% camcontrol devlist

will then show you which device equals /dev/cd0, e. g. 0,0,0
(1st SCSI controller, 1st device, 1st LUN).



If I did misunderstand the question, just post another one. :-)
(English is not my native language.)




-- 
Polytropon
>From Magdeburg, Germany
Happy FreeBSD user since 4.0
Andra moi ennepe, Mousa, ...