My iMac will not let me install an external disk drive. What do I do to install it?

How do I install an external disk drive?

Is this a new external drive you are trying to set up for the first time?
If so, connect it to the Mac, launch Disk Utility in the Utilities folder and format it as noted here:
http://osxdaily.com/2012/01/04/format-an-external-hard-drive-or-usb-flash-drive- for-mac-os-x/
All data on the disk will be erased!

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