Iomega external hard drive 500gb no longer recognised on yosemite

Hi, few days ago just upgrade my ios to yosemite and now
I can't mount my external hardrive iomega, I can see it on disk utility but can't mount.
what can i do?
ios yosemite 10.10.1
MacBook (13-inch, Aluminum, Late 2008)
Thanks!

Hello javibcn41,
You may need to put a check mark for the hard drive in the Side Bar pane of Finder's preferences (Finder menu -> Preferences -> Side Bar).
Mac Help - Finder sidebar
https://help.apple.com/machelp/mac/10.10/index.html?localePath=en.lproj#mh14108
Cheers,
Allen

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