Making Disc Images using mkisofs

I've got this tip from Linux Format Edition 137. Very useful indeed.

mkisofs is a wonderful utility to generate ISO images. To generate a compatible ISO images on a disc which are readable everywhere, consider the following commands

$ mkisofs -rdlJ -o disc_directory_image.iso directory/

1. -r : "Rock Ridge" format is enabled to allow long filenames on UNIX systems
2. -J : allow long filenames on Windows Systems
3. -l : Allow full 31-character filenames.
4. -d : Do not append a period to files that do not have one which violate ISO9660