A data dvd probably uses iso9660. I have a downloaded SuSE dvd image on my laptop. It is mounted using this entry in my /etc/fstab file:
/SUSE-10.1-0-DVD.iso /SuSEdvd iso9660 ro,loop,auto,unhide,utf8 0 0
You can use the "uid=" and "gid=" options as well if you want to. The umask, dmask and fmask options do not work. I think that it is a read-only filesystem.
Using the filesystem type of "udf" does not work in this case.
On my system, I have the image file itself selected as the source. The /SuSEdvd mountpoint is handy for exploring what is on the disc. For example, "rpm -qp /SuSEdvd/suse/x86_64/<package file> --info" for examining uninstalled packages.