and is it also possible that when i downloaded an new iso image from Knoppix that i don't burn the iso but e.g. i make a virtual cd. Just like deamon-tools for Windows: their i make a virtual cd form an iso so i don't have to burn it.
there are plenty of virtuall cd tools availlabe, some even for free. also several cd-burn applications like winoncd or clonecd offer such a virual drive. on linux you you just need to mount the image..

dt