I have exactly the same problem and symptoms as Donuts and have tried all the same troubleshooting steps with the addition of deleting upper limit and lower limit registry entries which worked for some people.
I have already tried installing the 64 bit SES drivers form this link:
http://wdc.custhelp.com/app/answers/detail/search/1/a_id/5419
I have already tried to run the firmware updater from this link:
http://www.wdc.com/wdproducts/wdsmartwareupdate/firmware.asp?id=wdfMP30_SEEssential&os=WIN
Installing the 64 bit SES drivers does not help. The same problem persists as Donuts already described it.
Attempting to update the Firmware does not work because the drive is not mounting so the Firmware updater does not recognize anything to update.
