My new Macbook Air is not finding my 2 terabyte external hard-drive that is plugged in?

Hi,
I just got a Macbook Air.  I need to use items on my 2 tbt external hd.  It is plugged in but I do not see anything on the desktop. Whats going on??
thanks
Cara

What are your Finder.Preferences>General?
Does it appear in Disk Utility?
Ciao

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