I used a eSATA adapter mounted in the case and to power the hdd, I use the ac power from a USB -SATA/Pata adapter like this one.
http://www.amazon.com/gp/offer-listi...53WNBGD18YD4N2

Either USB or eSATA, I can still read and do what I want with any hdd.
I paid $19 for my kit.