Re: How to check *CDROM* correctness?

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On 5 Apr 2003, David Krider wrote:

> On Sat, 2003-04-05 at 02:47, jdow wrote:
> > Use MD5SUM on the /dev/cdrom device.
> > {^_^}
> > ----- Original Message ----- 
> > From: "M. Fioretti" <m.fioretti@xxxxxxxxx>
> > 
> > > I am looking for a *generic* way to verify
> > > on *linux* if a generic CD I got, already burned, matches the ISO
> > > checksum which I found online.
> 
> Just using md5sum on /dev/cdrom WILL NOT WORK. The actual burned CD
> image is different from the iso file, but I don't know why. Even using
> md5sum on the SAME CD between 2 different drives will give you different
> answers. I know these things because I just tried this yesterday because
> I wanted to do the same thing Marco wants to do. I *know* I saw the
> proper way to do this online somewhere, but I can't find that
> information now. It was something about doing a dd out to a loopback and
> using md5sum on that???
> 
> Unless someone can post the definitive way to do this, the best thing
> you can do, unfortunately, is indeed, like others have said, boot the
> image and perform the tests.

If you cannot do md5sum /dev/cdrom or whatever the dev your cdron is on
and get the correct md5sum then the cd is bad. I have done this for years
and it works.

-- 
.............Tom	"Nothing would please me more than being able to 
tdiehl@xxxxxxxxxxxx	hire ten programmers and deluge the hobby market 
			with good software." -- Bill Gates 1976

   			We are still waiting ....





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