I had 2 of these drives plugged in after having them plugged in for a few hours one started beeping and could not be seen by the computer, using it on a USB 2 port.
After disconnecting both drives and leaving them disconnected for several hours, reconnected the beeping drive and no beep. Using WD Diagnostics software I ran a quick test and drive passed. Tried to run the extended test and 30 minis into the test it started beeping again. I tried to cancel the test but system would not let me cancel or close the application, used ctrl-alt-delete to stop the program and then disconnected the drive.
After approximately 1 hour I plugged the drive back in it was fine, copied all the information from the drive to the computer and ran quick test again with no failures no beep.
My computer is a new Lenovo B520 with maybe 40 hours of use.
Not sure if the drive is OK or not at this time and I am not so sure I want to run the extended test.
I think it might be a heat related problem.
Sure hope someone has insight as to what the permanent fix is.