I bought a 1 TB drive from Best Buy last week to use on my Mac, unfortunately it requires vista(bad) to work properly. tried to take it back, but their uncustomer unservice people said NO!. Apparently the shrink wrap sealed box had a different serial number then the unit. If you buy from then (DON'T) have them open the box and check the serial number or cavaet emptor! Better yet, buy from some one else!