Hi, there is an option in ROG Z390-I's BIOS, in Advanced -> PCH Storage Configuration -> M.2_2, says "Enable or Disable M.2_2 Port"
However, when I set it to "Disabled", the system still see my NVMe drive in the M.2_2 port.
Is this a bug?
BIOS version is 0805
Going by your BIOS screenshot your M.2_2 port has no device installed [empty] so where are you seeing the M.2_2 drive installed? Actually come to think about it, if you have your NVMe SSD installed in PCIe mode, then although you have disabled the SATA port for the M.2_2 it should show as an NVMe PCIe x4 SSD... or something similar. MAybe someone with experience with your board could help to clarify. I am putting together my Maximus XI Code in the next day or so, and see if it has a similar setting, and if so I shall try and repeat what you have done.