I went to my local libarary to use their DELL computers and got the same message about the disk not being formatted only this time when the message came up it also mentioned something about not being formatted for macintosh.
I'm going to assume, at this point, the information is gone altogether. That's okay though because I can reconstruct the information. It'll just take a few days to do that. I wanted to hope against the odds it's work on another computer, but it just wasn't meant to be.