I've been rebooting and inserting my external drives to the USB3 port without success, but after plugging a 1Gb Pen drive together with the 4Tb and rebooting, then the system disable all log ins for a few minutes... When I was enable to log in again both the 4Tb and the 1Gb drives were recognized.
I do not understand what happened but now it works...
Only the 1 Gigabit port with Realtek RTL8153 remains unrecognized.
tolingus