External hard disk does not show in finder

WD usb external hard disk does not appear in finder.  Disk utility sees it and will mount/unmount and eject.  I ran repair disk util. and all is well but still does not appear in finder 

Hey Hatter,  Thanx for the input. 
Among other things I tried was a terminal routine someone suggested with no luck and new drivers/firmware for the drive, again, no luck. 
I still don't know for sure what caused my problem, but I re-partitioned the drive and re-formatted it and that seemed to solve the provlem.  Sadly, I lost all my info that was backed up on that particular drive but hopefully it won't come back to bite me later. 
Cheers!!

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