I really like the WD My Passport drives but I am not sure if I should get the Studio or Elite. The Studio says it is preformatted for Mac, which is what I would mostly use it for, but there might be times that I need to swap files with a Windows machine. Would that be possible without reformatting the drive? Also, I like the black finish on the Elite better than the Silver of the Studio. So is there any reason to buy the Studio over the Elite? The Elite could always be reformatted for Mac, right?