My brother is going to get a Macbook Pro this September for university. He basically needs an external HDD to move all his stuff from his PC to the Mac as he plans on leaving the PC at home before he moves out. Problem is, I heard there are some externals that doesn't work with both PC and Macs as they both format HDDs in different ways? Is there an external that's garanteed to work between the two to allow easy file transfer? All he needs is about 500gb, and he's not willing to spend more then £50 for it.