Odd problem with sha1sums

[Gene Heskett]

I have now burnt 2 copies of the FC-6T2-live-dvd.iso, one on a +dvd and one 
on a -dvd disk.

Both of these freshly written dvd's check with an identical sha1sum when 
doing a 'sha1sum -b /dev/cdrom'.

But it doesn't match the sha1sum of the iso I started with!

Is this a known problem?  Fixable by turning off the dma on /dev/hdc maybe?

System is an FC2 box, with a newer kde-3.3.0, so k3b is still using md5sums 
which of course fail to check too.

-- 
Cheers, Gene
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