1. Create ISO file from cdrom or DVD
sudo dd if=/dev/cdrom of=/path/to/iso/file
sudo dd if=/dev/dvd of=/path/to/iso/file
mkisoft -o /path/to/iso/file /path/to/directory
# mkdir /dir/for/mount
# mount -o loop -t iso9660 /path/to/iso/file /dir/for/mount