You...you...made me use Terminal for the first time
So I typed in "sudo mdutil -i on "/Volumes/Martha My Dear" which seemed to work fine as it just took the command and returned me to ">".
But then I tried to drag the disk image into the Spotlight privacy window, and it won't add it to the list. It's my internal disk which I use as a backup, but I boot off of an external disk.
Any ideas?