I bought a WD20EARX with an external box. They are not compatible. The tests with Data Life Guard Diagnostic Tool are all wrong (too many bad sectors detected), while performing tests it’s like interrupt the USB connection. I replaced the box, then the hard disk for two times. It’s the third hard disk that shows me the same problem. Now, I’m looking for an external box which is compatible for sure with the WD20EARX. I don’t know what to do anymore, help!