After both my MacBook Pro (Mid 2012) running El Capitan 10.11.6) and my MacBook Air running Sierra 10.12.5 failed to recognize my WD easystore HD right out of the box, I have been trying to repair it in Recovery. But when I run First Aid, it tells me to run it in Recovery - when I'm in Recovery!!! Can it get any more idiotic?
The problem is apparently "problems with the partition map which might prevent booting." Ok, so?
How do I fix this drive - that can't be recognized, right out of the box, and that my Mac - in Recovery - tells me to repair in Recovery??!!