Error: Couldn't unmount disk -- when trying to verify/repair external hard drives.  Has anyone had this problem and solved it?

I have a number of hard drives that my Mac Book Pro no longer 'recognises' at least for very long.  When I turn them on the deskstop icon shows up but then shortly afterwards I get a message saying that it has been unplugged incorrectly.  I haven't unplugged it any of them.  When I try to run very/repair disk before they disappear I get the error in the subject line above.  Has anyone had this problem and if so how did you rectify it?

The drive is malfunctioning and needs to be replaced, or you have some other hardware fault.
Make a "Genius" appointment at an Apple Store.
Back up all data on the internal drive(s) before you hand over your computer to anyone. If privacy is a concern, erase the data partition(s) with the option to write zeros* (do this only if you have at least two complete, independent backups, and you know how to restore to an empty drive from any of them.) Don’t erase the recovery partition, if present.
Keeping your confidential data secure during hardware repair
*An SSD doesn't need to be zeroed.

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