I had the same problem. Not sure what you are trying to do with your system and Knoppix, but I got SystemRescueCd-x86-0.3.4to boot from the CD and find the SATA disks. http://www.sysresccd.org/
I did have to statically assign an address. I mostly use Knoppix for imaging and other maintenance/rescue tasks and SystemRescueCd has what I need.