According to this page:
Right, but since I don’t have any cameras that produce RAW, that’s not what it is. Besides, you are talking about a file format, not a disk format. Big Difference.
I think scr4 nailed it (not that I couldn’t google it myself, but it wasn’t something I desperately needed to find out!). The drives that show RAW format are disconnected network drives from another computer.
I agree with everyone that you should act to preserve your pix first, then mess with the formatting or whatever.