Oh I see- yes of course the cd is read-only. You can remaster the cd to include software you want, you can save some things in "persistent home" but I am not overly familiar with it as I do not boot from cd. You can also load some things from floppy on boot. I am probably not the best source of advice/info on this subject because I use a hard drive installation. You could do searches for "knoppix.sh" "persistent home" and "remastering", in fact you could look at the "cutomizing knoppix" part of the forum.