Issue with Time Machine and WD Elements external drive

I am experiencing continuous problems with Time Machine set to back up to a WD Elements 1TByte external disk; appears to backup files perfectly but I'm plagued by recurring message 'The disk was not ejected properly...'. Dealer assures me that the disk is fine. No problem if Time Machine is disabled. But then I have no back up...

christopherfromadelaide wrote:
In fact, when I turn off Time Machine, I still get the ... message, which flashes up every 30 secs or so, and only goes away when I unplug the external drive.
That indicates that the problem may not involve Time Machine at all.
To be sure everything else is ok, verify your internal HD and repair the WD drive, per #A5 in  Time Machine - Troubleshooting
If the problems persist, try different port(s), cables, and combinations of the two (a plug that works fine in one port may only make marginal/intermittent contact in another).  Also make sure the WD's power cable is snug and secure, and it's plugged-in to a good power source.

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