I have the same problem with the DVD. I will admit I did not check the checksum. But I have the exact same error as Sebiskka.

The DVD loads part of Linux, then it tries (and sucessfully) finds the usb/firewire.

Next it looks for the DVD (which it just loaded part of Linux off of) saying

"looking for DVD in dev\hdc. "
Then it give the nastygram about "Can't find file system...."

I tried" knoppix testdvd" and" knoppix 2", with the exact same results. When I tried "failsafe", I got a more verbose start up, but it again failed in the same place.

This is on a dual opteron w/ a gig of memory. I have run 3.7 on this machine previously.

Thanks for your help...