The final conclusion is that the WD Black² isn’t compatible with Mac at all. My Mac Mini will cannot see the drive when installed. So there is no way of installing Mac OS on the disk. It took a couple of weeks with to get an answer on my WD support ticket that I raised. I also tested it my self. There is no contact to the disk either from the cloning SW or from when it is installed inside the Mac. So all the info I have received from WD staff on this forum was useless.