After a reboot my 4TB drive refuses to initialize again, shows up as unknown device.. Sucks a bit, have to see if I can get it sorted today.
All I did was to remove a 500GB ssd - then left the other drives, rebooted. It then showed up as unknown device, uninstalled device, refreshed - it then worked. Installed updates, did another reboot - then it shows up as unknown again, but the above trick does not work anymore. hmm.