Is it possible to move the Knoppix CD (3.7, 2004-12-08) to another CD drive once Knoppix loads?

I have an internal DVD-RW and external (USB) CD-RW drive, and want to boot Knoppix from the cd to rescue my harddrive (it had a head crash and damaged the part where Windows is stored, so windows won't boot). However, Knoppix only boots when I put the cd into the internal DVD drive, and not the external CD drive... Thus, I can rescue my files by burning them to CDs, but I can't make a DVD, Knoppix is taking up the DVD drive.

Is there any way to boot Knoppix from my DVD drive and then make Knoppix run from my CD drive?

Or, is there any way to save my files to a DVD with the setup I've described? (Knoppix in the internal DVD drive, and use of an external CD drive, preferrably without using the harddrive - it's NTFS anyway.)