Didn't eject my external hard drive now it will not reconnect

I just got my MacBook Air, been using a PC up until now.  Earlier this morning I plugged in my external hard drive and transfered some music onto my MacBook Air.  When I removed my external hard drive I didn't not eject it, now when I plug it in my MacBook does not even see it.  I tried different hard drives and I can see them. I even tried using that hard drive on my old PC and it works. How do I get my MacBook to recognize the hard drive again?  Still new to the whole MacBook experience.

I did the same and was able to see it in Utilities, but not mount it.  I read this article and followed the steps and it fixed the problem http://osxdaily.com/2013/05/13/mount-unmount-drives-from-the-command-line-in-mac -os-x/
Utilities - Terminal
Type:  diskutil list  to find your drive (mine is disk2s2)
Unmount the drive:  diskutil unmount /dev/disk2s2
Mount the drive:  diskutil mount /dev/disk2s2
The drive immediately appeared on my desktop allowing full access with no damaged files or corrupt disk. 

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