I'm trying to burn a Knoppix iso, and my first attempt with K3b just wasted a cd. (GRR...I hate throwing money away!)
So I tried to do it with cdrecord -v speed=2 dev=0,0,0 -data Knoppix-blahblahblah.iso
and that said some /dev/sg* didn't exist.
What really confuses me is that I tried the exact same command last to to burn a Slackware ISO and it worked flawlessly.