You need to get and apply the uEFI Hotfix. Link is in this
http://community.wd.com/t5/WD-Sentinel-Products/uEFI-GPT-Hotfix-available/td-p/649727
You need to get and apply the uEFI Hotfix. Link is in this
http://community.wd.com/t5/WD-Sentinel-Products/uEFI-GPT-Hotfix-available/td-p/649727