I know this is an old thread, but it’s still open and the link to the Nero utility is dead, so here’s another way.
View the optical disk in ISOBuster. Expand the tree on the left far enough to see the files in the Track #, and the file system[s] will be identified with an icon
(legend - http://www.isobuster.com/help/file_systems )
then, if you right-click the volume name next to the icon and choose [B]Properties[/B], on the Advanced tab of the dialog that opens it will tell you the [B]File System[/B] type there, too. There can be more than one file system in a track, of course. e.g. most bootable CD/DVDs have both [B]ISO9660[/B] and [B]Joliet[/B] file systems with pointers to the same physical files.
I would post a screen grab of that dialog, but attachments aren’t allowed here; a linked img BBCode would end up as dead as the Nero link eventually (as that isobuster.com help section link probably will, too).
Hope that helps.
edit: Here’s the current nero infotool link - http://ftp6.nero.com/tools/InfoTool.zip
Note that’s nearly 29MB compared to ISOBuster’s 4MB.