Finder doesn't show external hard disk

I have a multimedia hard disk which until recently when I connected to my Imac it would show on the left side column of Finder. lately, though, it either takes a while to show up or it doesn't. The disk works fine when I connect it to may TV. Is there a command to "search" external devices or to get a report of what is connected?
Thank you.

Hi LM,
To add to the advice above, sometimes an external drive won't mount in the Finder or Desktop if the internal drive hasn't enough free space. Open Disk Utility, select MacintoshHD in the panel on the left, select the First Aid button. Now look at the bottom right side of the window. You'll see: Capacity and Available. Make sure your available free space is at least 20% of the total capacity. It takes 15% just to boot a Mac.
Carolyn

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