Why Does my external Hard drive not show up when i plug it in?

I have a 100Gb external harddrive formatted for mac's only. It didnt show the first time but then showed the second and third time i plugged it in and now it wont show again. why is this? Is There a way this can be fixed?
Thanks,

Show Hard Drive on Desktop...
Finder  >  Preferences  >  General  >  Show these items on the Desktop.

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