Question HDD won't work with SDD or vice versa

Nov 11, 2020
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I have a Samsung 850 250gb EVO SSD which I have been using with a Seagate 1TB HDD for the past while. My os is installed on the SSD.

I recently bought an 860 EVO 1TB and when I have it plugged in with the Seagate HDD it will not detect the SSD. It won't even detect it in the BIOs.

When I unplug the HDD, the new SSD works fine and vice versa. My 850 EVO 250gb which has my OS works always and never has conflicts.

Any suggestions? I have the STRIX B450-f gaming mobo, Win 10.