In my case I want to do it in Knoppix 7.2 CD, it's what I normally use.
I can only see in /KNOPPIX-DATA: etc, home, lost+found, opt, root, usr and var.
So, as I read in the link you posted, is this what I must do? (because in that folder I don't have bin, sbin and the others):
sudo mkisofs -R -U etc home lost+found opt root usr var | create_compressed_fs -B 131072 -m - - > /tmp/KNOPPIX1

When it's done, must I copy the KNOPPIX1 file to DVD-directory folder before making the iso?.
I don't know how it will work when I boot if I only added a file: KNOPPIX1
Thanks again.