I'll share that for my home server I upgraded my router so it could host a HDD. Currently I have a 500GB HDD on it and thanks to CNET's Cheapskate ( http://www.cnet.com/cheapskate/ ) I snagged a 2TB USB powered HDD to give it a boost by 4 times.

Power draw appears to be under 1 Watt most of the time so for what I wanted, a win. Cost? 99 bucks for the drive.
Bob