Opening the units and breaking the warranty might not be worth it

Yeah, that's what I was thinking too. Going about it with ghost software would implie removing the Hd's from your Riocars and using them in a PC, which would mean breaking all the warranty seals and thus voiding your warranty. Not worth it to obtain a speed gain of maybe double that over ethernet IMO.
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Riocar 80gig S/N : 010101580 red
Riocar 80gig (010102106) - backup