Verifying integrity of LiveCD?

[Harald Hoyer]

Oisin Feeley wrote:
> Hi all,
> 
> What is the preferred way to verify the integrity of the various
> LiveCDs available for the F9-Sulfur beta? I tried to test the
> i686-LiveCD and was unsure whether its failure to boot was due to a
> corrupt burn and/or download.  There seems to be no sha1sum or md5sum
> available on the prerelease page[1] to enable a quick check of the ISO
> image.
> 
> The specific issue which I'm seeing is probably a specific optical
> drive issue, however the above possibility is one which it would be
> nice to be able to eliminate.
> 
> Best wishes,
> Oisin Feeley
> 
> 1. http://fedoraproject.org/get-prerelease
> 

To get the checksum of the burned image, my preferred method is:

# head -c `isosize /dev/cdrom` /dev/cdrom | sha1sum