Install Knoopix to your second hdd and let it install LILO to the MBR. You won't have to change your BIOS settings everytime you want to boot into the other OS. Just select it from a menu instead. You could tho if you wanted- just choose "no" on installing LILO to MBR and it will instead be installed to the Linux hdd. Then you can choose the second hdd from the BIOS and boot taht way although it's a rather inefficient way to do it.