My external hard drive from Western Digital will not open

My external hard drive from Western Digital will not open, it is still displayed in thewindow units and printers, who do I, but on my PC, Windows 7, via computer, view allhard drives to open leave, then the My Book Essential displayed .

Please post your question in the main section of the Western Digital Community if you want to post in English, because this is  the German forum.

To get some help for your problem it is best to contact the WD support

http://support.wdc.com/contact/index.asp?lang=en

or have a look at this Knowledge Base entry 

http://wdc.custhelp.com/app/answers/detail/a_id/1708