Knoppix will mount the device read-only by default. As root, run remountrw /dev/sda# where # is the device number. What's the trick to getting knoppix to mount the usb device? I've been having mixed results with my cruzer. I got it to mount today under /dev/sda/ and couldn't reproduce it after a reboot. I'm actually running Kanotix now. Hope this helps.