md5sum a dvd?

I downloaded ubuntu-6.06.1-dvd-i386.iso and verified the md5sum against that
listed at the download site. I then burned the DVD and got no errors. One
nice thing ubuntu has in the 6.06 release is a menu option (on booting the
CD/DVDs) to verify the CD/DVD content. When I tried this, it shows errors
for some files.

Surely there could be a problem with the burn, but I was wondering if there
is any way to md5sum the DVD? The only thing I could think of is to make a
.iso from it and I do not know if that would even be expected to reproduce
the original iso and match its sum.

I realize I probably need to burn another DVD, but the question is still a
valid one.
--
Be who you are and say what you feel, because those who mind don't matter
and those who matter don't mind. - Dr. Seuss
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