Lacie brand hard drives and burners are excellent and guaranteed to work with your Mac system as long as the system is reasonably current: ie: OS not older than 2 years, machine not older than 3-4 years. We have an 6+ year old Lacie CD burner that still works. Right now our Director Allex Michael is considering purchasing a Lacie 800GB or Terabyte model, due to it's competitive price. However, we can buy a Seagate hard drive with a 5 year warranty and stick it in an enclosure (1 year warranty) for less than the price on most Lacie's. That way we still have a 5 year warranty on the hard drive. Of course there's more risk this way ie: compatibility issues etc vs Lacie's good service. But we prefer to have the longer warranty. Lynn ................................... Producer of the upcoming eerie action thriller "Search Dog's Raven" (SearchDogsRaven.com) ...Any search can turn deadly, as a young woman and her wilderness search dog are lured down a dangerous trail...