Question Get inaccessible boot device when I turn off raid mode

[mattds9]

I just built a new pc, when I turn off raid mode in the bios so I can access my HDD it gives me an inaccessible boot device error
My PC has an asrock phantom gaming z390 4 atx MOBO and the 4.0.0 bios on it a 1 TB SSD and a 3 TB HDD
Thx in advance

 

[rgd1101]

try to boot with only the os drive connected