I think it should work. I don't have that particular external drive but at one point mine was partitioned for both.. I would also try a quick google search. Hope some one can help you a lot more then I. Maybe even call there customer service. The manual may say but I doubt it.
Yes, you can partition for OS X and Windows, or just use a file format that both can use. You don't ever have to use any software that comes pre-installed on any HD. You can always partition and/or format any drive however you choose.