Computer Fails to recognize 2 MyBook Essential 2 tb drives at once

[Joe_S]

See if this will help  http://community.wdc.com/t5/My-Book-for-PC/when-I-connect-two-quot-My-Book-Essential-quot-drives-only-1-is/m-p/49988/highlight/true#M2419   I think it might have the answer to your problem.

Joe