Yosemite: problem with external disk

Hello,
After installing Yosemite I cannot use Time Machine anymore because the external disk (WD My Passport Edge) cannot be mounted. Does someone know what to do? Thanks in advance for your help.
The Disk Utility Program shows the external disk however none of the action button is active.

See mount section at the end.
Disk Unmount Using Terminal
Disk Utility – Force Mount Disk

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