Hello! I am new to this 'Daisy Chain" thing. I have a WD Studio 500GB right now connected through USB to be a wireless drive through my Airport Extreme. Thing is, I am running out os space and am wondering if it is possible to daisy chain a second drive to my WD to increase the size. I know how it is possible to daisy chain through FireWire 800, but can I daisy chain to my WD that is connected to my airport through USB?