Is it possible to have both of these operating systems on one hdd in different partitions so you can run either?? If so, what format is a hdd with mac supposed to be in? Like with windows its NTFS or Fat32 for older ones. I want to do this because I don't know much about mac and think I should get some more knowledge of it but have XP right now, and want to keep it, but I want to be able to go into either one. If you can't partition both of these on one hdd, you CAN do this if you have 2 hdd's correct? Also, how do you suggest partitioning a hdd? What software should I use?