Just downloaded the Knoppix iso and booting it gave errors, so I checked the iso :

md5sum -c KNOPPIX_V4.0.2CD-2005-09-23-EN.iso.md5
KNOPPIX_V4.0.2CD-2005-09-23-EN.iso: FAILED
md5sum: WARNING: 1 of 1 computed checksum did NOT match
'ls' produces:
total 711832
728190976 2005-09-24 00:58 KNOPPIX_V4.0.2CD-2005-09-23-EN.iso
69 2005-09-24 03:37 KNOPPIX_V4.0.2CD-2005-09-23-EN.iso.md5
Please say YES
Downloads take a looooong time here in South Africa !