To make a CD image of a directory with Rock Ridge and Joliet file support:
mkisofs -o name_of_file.iso -J -r /home/username/name_of_directory
Then
cdrecord -v speed=8 dev=0,0,0 name_of_iso_file.iso
(Note that you need to get the info for the ‘dev=’ part by running ‘cdrecord -scanbus’)
To copy a CD to an image file you could use this:
dd if=/dev/scd0 of=/home/username/isoimage.iso
or
cat /dev/scd0 >> /home/username/isoimage.iso