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SSD cannot be detected

Level 7
Newbie here, so bare with me 🙂

I have a Formula XI motherboard, and when trying to add additional SSD drives, one of them cannot be detected, not in BIOS nor in Windows.
My specs are as follows:

i7 8700k
2 x RTX 2080ti
32 gb ram
1 x M.2 SSD Samsung 970 Evo Plus 1TB (For OS)
1 x 4 TB HDD

So now, I am trying to add another 3 additional SSD Samsung 860 Evo 1 TB, but only two of these are detected. I cannot see the third one no matter what, not in BIOS nor in Windows. I am not using the 2nd SATA port, due to it being disabled because of the M.2 PCI usage.
What could be the problem here ?


Level 10
Those 860 EVO's are they 2.5" sata based, or M.2 based? The 860 comes in both formats
Which one('s) are you currently using? That 970 Evo Plus only? If so, is it connected to M2.1 or M2_2

Please note:

M2_1: Supports Sata & NVME (like that 970 Evo)
M2_2: ONLY supports NVME so if one of those 860's is M.2 based, you'll need to place the 970 evo in the left M.2 socket (M.2_2) and the sata model in the right one (M.2_1)