dd if=/dev/cdrom of=my.iso bs=2048
sudo umount /dev/cdrom readcd dev=/dev/cdrom f=my.iso
mkisofs -l -r -J -hide-rr-moved -no-emul-boot -boot-load-size 4 -boot-info-table -b path/to/bootloader/isolinux.bin -V "volume_id" -o name.iso /path/to/files/