We're switching this week from PC to a new 2013 base 21" imac and what I'd like to do is copy my itunes, ripped dvd, photo, and home video files from my pc to an external HD and then use that external HD with the mac. I understand about formatting the disc in the exFAT format so I can use it with both computers, but I'm uncertain about the folder system. Can I just point the Mac to use the external HD as the location for itunes, and iphoto? I couldn't really tell based on searches I did. Also is there a way for me to use the external HD for the location of my photostream files like on a PC, or do I have to manually transfer them every so often from the main HD to the external one? Thanks and sorry for the questions.