I have Knoppix 3.7. I recently installed a second hard drive on IDE channel 0 set as slave. Before hard drive install Knoppix worked fine and the hdd icon was on the KDE. After second hdd install Knoppix does not show hdd icons on KDE. I also tried to copy tohd=/dev/hda1 and when knoppix tries to copy I get the message /dev/hda1 is not mountable.

some sytem info;
IDE 0=C and D drives windows98 FAT32
IDE 1=CDrom

Knoppix worked fine with one hdd and was able to copy to hda1.