You're not dreaming. The CD Writing HOWTO claims that 1:1 copies are
possible using dd and cdrecord. However, this is not completely true. The
problem here is a simple one of semantics. Unfortunately, I've found that
many people have a different definition of what a 1:1 copy is or should be.
Personally, I view a 1:1 copy as something that is identical to the original
on the smallest order of measure available, be that bit for bit or smaller.
However that is not what many refer to as a 1:1 copy. For many something
that works as the original did (or in the case of audio, close enough not to
be noticed normally) is a 1:1 copy. So long as there is not some form of
copy protection involved (such as SafeDisc) dd and/or mkisofs work
wonderfully. However, they are not able to compensate for these copy
protection schemes. This would be the reason I recently posted looking for
something closer to a true 1:1 duplication method under Linux.
Jamin W. Collins
-----Original Message-----
From: Jeff Graves [mailto:[EMAIL PROTECTED]]
Sent: Monday, July 24, 2000 11:04 AM
To: [EMAIL PROTECTED]
Subject: RE: CD Duplication
I've never tried it but I work for a company that does CD
Duplication. All of the recorders and software has to be able to
read sub-channel data so that we can copy CD's for companies that
put the SafeDisc protection and such on their CD-R's. It doesn't
matter for CD-ROM's because they are phyically stamped out, but we
use special equipment and software that does bit-for-bit copying for
CD-R's. Basically it's just robotics with SCSI Plextor CD-Recorders
and a SCSI Plextor Reader and some other things (like a printer and
storage bins). The only problem is that the software runs on NT. I
don't know the capabilities of dd or mkisofs but I thought I read
that you could do 1:1 copies. Maybe I'm just dreaming.
Jeff
-----Original Message-----
From: Leonard den Ottolander [mailto:[EMAIL PROTECTED]]
Sent: Sunday, July 23, 2000 8:28 PM
To: [EMAIL PROTECTED]
Subject: RE: CD Duplication
Hi Jeff,
> Your reader must be able to read sub-data and your recorded needs
to
> support raw-writing. After that I think cdrecord will work.
Have you ever tried this? That would be a new feature that I'd like
to hear
about!
> Or maybe use mkisofs and then cdrecord.
Well, ISO images do *not* contain subchannel data, so this is
definitely out
of the question.
Bye,
Leonard.
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