Create an ISOimage

It is possible to create an ISO image file using the mkisofs. The mkisofs is a standard utility of FreeBSD OS.

% mkisofs -joliet-long -o cdFile.iso cdtree/

where cdFile.iso is the name of a new ISO image file
and cdtree/ is a path to directory containing the files and directories to put in the new image file.

You may want to use  -joliet-long flag to preserve the long names inside the image.

Sources

1. 18.5. Creating and Using CD Media
2. man mkisofs
3. .