Cdrecord

mkisofs -r -o cd_image somedir/;
         cdrecord -v dev=4,0 speed=2 -isosize some_image
         mkisofs -J -l -r /some/dir | cdrecord dev=4,0 speed=2 -pad -data
         - ,
         dd if=/dev/cdrom | cdrecord dev=4,0 speed=2 -data -pad -