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Re: cd burning not going well

On Tue, Jun 24, 2008 at 21:21:23 -0300, tyler wrote:
> Bob Cox writes:
> > On Tue, Jun 24, 2008 at 15:35:00 -0300, tyler wrote:
> >
> >> A typical result is burning the CD with KB3, which appears to work, but
> >> then complains that the disk image does not match the downloaded ISO
> >> when the verification check completes. 


> > Using K3b it burnt it ok, but failed verification just as you say.  On
> > the other hand, this is the first time I have ever ticked the
> > 'verification' box so do not know if this is a frequent problem or a K3b
> > oddity.
> >
> > However the resulting CD worked perfectly; the 'check CD integrity'
> > test, which you mentioned, passed ok and Xubuntu appears to be running
> > perfectly, so really none of this is of much use.  
> More useful than you'd think! I grabbed one of the growing pile of CDs
> that failed k3b's 'verification', and sure enough it passed its own
> 'integrity check' and now appears to be running just fine.
> I ran both the k3b verification and the Xubuntu integrity check on each
> of the first 6 failed burns, and since they all failed both tests I
> assumed the k3b test was enough to indicate a disk was bad. But
> apparently not. Now I just have to sift through the next ten disks to
> see how many of them are usable. At least one is. Does anybody know what
> the k3b verification is actually verifying?

AFAIK, K3B is supposed determine the md5sum of the burned CD and compare
it to the sum that it previously calculated for the ISO image. I have
seen this procedure fail occasionally.

When in doubt, calculate the md5sum of the raw device (with the disk
still inserted, of course) yourself, e.g.

md5sum -b /dev/scd0

The output should match the md5sum of the ISO image.

Regards,            | http://users.icfo.es/Florian.Kulzer
          Florian   |

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