What bothers me these days: I bought an exteral enclosure and a seagate 320GB disk to make a clone of my disk so it can be replaced by the new seagate disk. When working with Windows XP via Bootcamp the disk works just fine on both the left and the right USB port. But when I'm running OSX, it just doesn't work at all! I coudn't test it with the disk powered by both USB ports, because the cable is too short.