I had my HR24 upgrade today but could not lay my hands on a WD20EADS for the eSATA enclosure. I generally don't toss money at Best Buys, but they had a WD20000CSRTL in stock for a Newegg type price, so I took the plunge. It booted right up in the AZiO ENC311SU31 enclosure. (My enclosure of choice) And is running cool and quietly. Time will tell how it holds up but it does work.