Gave up finding an external enclosure!
I had the external hard drive enclosure on one of my THR22's fail. It was just a no name with a fan. So I figured I would step up to a Thermaltake which is recommended (I bought two so I could upgrade one of my other units). Failed, hard drive not seen, both units. With a known good drive. I tried two other HD's a new Seagate 2 Gb and a new WD 2 Gb, same issue. I just ended up using them for backup drives on my PC's. So I tried a Rosewill that's also recommended. Also a fail. I looked online for the Antec that DirecTV recommended, $170!! for an enclosure??
I just gave up and installed the drive from the failed unit directly in the THR22, booted up fine, didn't format, all my programs intact. I do prefer the external drives for convenience, but at this point I give up!