🚀 go-pugleaf

On Fri, 19 Feb 2010 21:29:48 +0000 (UTC), Ilya Zakharevich
<nospam-abuse@ilyaz.org> wrote:

> On 2010-02-19, Mark F <mark53916@gmail.com> wrote:
> > On Thu, 18 Feb 2010 18:56:27 +0000 (UTC), Ilya Zakharevich
> ><nospam-abuse@ilyaz.org> wrote in part:
> >
> >> > What I am looking for is a utility that can compare an ISO image file
> >> > (xyz.ISO) to a burned CD/DVD based on the same ISO image file.
> >> 
> >> "A burned CD/DVD" *is* a file.  At least on reasonable OSes.  E.g.,
> >> did you try \\.\M: ?  If Windows does not support this, one can just
> >> make an ISO image from the disk, and use FC (or diff).
> 
> > Sonic Record Now and some other programs that I have used include some
> > identifying information in the .ISO file.  Perhaps another format
> > would give the same result every time I made an image, but can't
Oops: I left out a word.  the above should say "but I can't"
> > switch from .ISO.
> 
> I have no clue what you are talking about.
"Sonic Record Now! DELUXE Build 730B75D" will save as .ISO or .GI;
other programs that I have support additional image types.
However, for interchange purposes I have to use only .ISO, even though
it varies from run to run with the programs that I have.

Note that I don't know if the Sonic or other programs that I have,
including MagicISO that I have are actually making .ISO files that
meet the standards - only that the created .ISO files varied from run
to run when I tried things before 2008.  I tried Sonic Record Now
with one CD today and the .ISO file was the same for both runs,
so either the differences I saw in the past were not in header/trailer
identification information in the ISO files or patches that I
applied in the last few years fixed the problem.

Can you point me at a definition of CDROM .ISO files?
I found:  

http://www.ecma-international.org/publications/files/ECMA-ST/Ecma-119.pdf
(1987 "reprinted" in 1998) which is the standard for the on-CD data,
but I couldn't find a standard for ".ISO" files, so I don't know if
are actually forbidden to have identifying information.
 
> 
> > In particular, making an ISO file from the same
> > real or virtual CD gives different results each time
> 
> Then the probrams you use are broken.  ISO image is just a copy of the
> DVD (or of "the 2048-sectors" of CD).  All copies should be the same.
> (And I expect that \\.M: would be always the same as well...)
> 
> Hope this helps,
> Ilya