Quote Originally Posted by madoka
I grabbed KNOPPIX_V5.1.1DVD-2007-01-04-EN.iso from kernel.org, but my download appeared corrupt (MD5 hash mismatch). At first I thought the problem was in my end, so I re-downloaded it, this time from a different mirror. However, my new download also don't have a matching MD5 hash. It could just be confirmation bias, but my memory's telling me that the two incorrect hashes are the same, which implies that the file hosted on kernel.org is corrupt. As it is one of the master sites, it would explain why the mirror's also hosting the same file.

Could someone humor me and double check if they get the same results I did?

3735df5c816890d4637196493b1ded76 (INCORRECT)
e967af32cc5b9e7a91825877b65555a8 (CORRECT)
I got exactly the same results as you.
I downloaded from:
ftp://knoppix.cs.wisc.edu
and the filesize was 4,324,202,496 bytes.

Since it would take a long time to re-download, I suppose it might be a good idea to burn the DVD and then boot it with the option for checking the integrity of the files. Have you (or anyone else) tried that yet?