This morning, woah, I've tried to make an Iso of a Debian CD-ROMs. I've failed with the "dd" command, then I was looking for "mkisofs". What a wonderful world, mkisofs is already packed in my system. So, I've just done :

mkisofs -o /tmp/mydebian.iso -J -R /media/cdrom0

and everything was running right after few minutes. Enough for a coffee time.