I'm using Sonnet's Tempo ATA card in my quicksilver to power at least one, will eventually, two extra hard drives. I already have two 80 gig drives, one was stock and the other was added in, then I have the others connected to the ATA card. I'm using OSX, and the only thing I dislike is that the deep sleep function not longer works. Plus with OSX you can setup the drives for a raid if needed.