Thank you !
I'm trying at this time to clone my WD SN740 to my new Corsaire MP600 Mini to obtain a stable system.
I think the problem with WD SN740 is that this drive needs 2.85A under 3.3V (so max 9.4W) to work. And this is too high for the port of the SP8 Pro. The Corsair MP600 Mini needs only 2.5A under 3.3V (so max 8.2W) and probably this sinificant difference is the reason why it works.
I'll try in somes hours (because problem with my cloning solution.