I purchased this drive back in 2011 and it seems that the circuit board in the enclosure has stopped functioning. If I plug the drive into internal sata or another USB to SATA device I can see the drive however the data is encrypted and I am not able to see the partition etc and windows wants to initialize the drive which I cancel out of. So the Drive seems to be good still.
This is printed on the circuit board: 4061-705089-001 Rev AG
Western Digital-My Book Essential 2TB External USB 3.0/2.0 Hard Drive-Black-WDBACW0020HBK-NESN (Enclosure actually says WDBACW0020HBK-00).
EDIT: Please let me know if you know of anywhere I can purchase a working circuit board.