md5sum on CD

[Moniz Family]

I'm having some problems burning CDs and am trying to check whether it's 
the burner or the CDs. One of the things I'd like to do, but can't 
figure out from the man pages, is to run an md5sum on the entire CD to 
compare to the ISO image I downloaded. Is there a way to do this without 
first making another ISO image from the CD? If so, would it give the 
same result anyway?

On a related note, I downloaded all 4 ISOs for Fedora Core 4, but none 
of them had the same checksum as specified on the mirror site. I tried 
downloading Disk 1 a second time and had the exact same (but incorrect) 
checksum as the first try. I asked my neighbour to download Disk 1 and 
he got the exact same (but incorrect) checksum as I did. Coincidence??? 
Is it a common occurence for the checksum to be wrong, but consistent? I 
think I tried different mirrors each time.

Thanks, 

John.
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