What are you using for your boot loader now? I assume the XP boot loader on your first drive.

You will need to set up a boot entry in your boot loader that points to the lilo setup on your knoppix install. I can't help you with xp. I think you'll end up not being able to use xp if you put the lilo mbr on your first drive. So what you need to do is set up your xp boot loader to go to the boot partition of your second drive then you should be able to access knoppix on that drive.

HTH

rock