I have an external hard drive that contains a bunch of old back-up files. I also have an internal hard drive in my Windows XP box. Is there some utility that will allow me to find out which files (if any) on the EXTERNAL drive are not also present on the INTERNAL hard drive?
Note that this is the opposite of duplicate-checking -- I'm looking for a list of files that are NOT duplicated. My expectation is that all (or almost all) of the files on the external drive are also present on the internal drive. A list of duplicates would be horribly long.
I've heard that a utility called Total Commander can do all sorts of fancy file comparisons, but I'm really looking for any solution (freeware is better, obviously).