How to add a WD My Book Essential 2TB to a Time Capsule?

WD External Drives External Drives for Mac
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Thanks for that reply - the outage a few weeks ago cleared my profile it seems - hence the late reply. 

I did try to connect a different external harddive - i tried a non-powered iOmega and it was perfectly recognized by the TC. 

I am a bit lost - why does my TC not simply recognize my WD external harddrive?