K3D burning

[Markus]

How about booting featherlinux from a USB pendrive, do you have one?
You could use knoppix LiveCD to create the featherinstall on the USB drive and with that you could then burn any iso you want.
http://featherlinux.berlios.de/usb-instructions.htm

[markpreston]

have you specifically tried
knoppix tohd=/dev/hda1
at the boot prompt. Then the next time you boot Knoppix enter
knoppix fromhd=/dev/hda1
Then you can take the CD out of the drive and knoppix will continue to load from the /dev/hda1 image.
This should then allow the CD drive to be used to burn a new .iso