Looking at Seagate site, even newegg, the hard drives for mac are incredibly more expensive. I doubt the interface is different, so the only other option is how it is formatted. If the drive is formatted differently, at an extra cost, I am curious if OSX is capable of formatting externals on its own? Can I buy a standard drive and format it natively in OSX? I only ask, because after coming from Home Premium, several hardware utilities are non-existent.