This sounds pretty unfortunate for both of you, @Alex & @Jerome!
🙁
The clicking noises indicate internal hardware failure on the external HDDs. Sadly, this is something that cannot be fixed.
I'd strongly recommend you to
check your warranty status and get in touch with our
Customer Support either by phone or e-mail. In case both of your external WD drives are still covered by the warranty, you should be able to
send an RMA request and get replacements.
If you have important data that you wish to recover, make sure you refer to the
Data Recovery partners on our website.
I'm sorry that you are encountering such issues with our drives, though.
Hope I was helpful. Let me know...