I am using the latest iMac with the latest 500GB LaCie external D2 Hard Disk. I'm using Firewire 800. Can anyone tell me what the AUTO setting on the LaCie's power switch is supposed to do? The HD seems to function no differently at either ON or AUTO setting. I've tried to extract info from LaCie (via e-mail support) but all they say is that in AUTO, the drive should power up or down when the computer does. But that's what happens in the ON setting, so what's the difference? They are most unhelpful. Also, the blue light on the front remains on at all times in AUTO or ON, regardless of whether the computer is switched off, or if the Firewire cable is attached or detached. The light only goes off if actually switched to the OFF setting. What's "auto" about that? Looking online, it seems plenty others have a problem with this function, but I see no answers. At the Apple Store, one tech told me the AUTO function on any LaCie HD simply doesn't't work! Is this true? Has anyone seen any differences between using their LaCie at AUTO or ON settings? Thanks.