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OK never heard of that kind of behavior... Had to create a storage space for each of the drives and now they appear in Disk Management and seem to be working fine. Thanks for the help, I would've never got that !

Yes they are showing up.

The new drives don't appear. Last 2 are USB sticks.

Hi all, Just finished a new build and the 2 new drives (1 nvme/M.2 and 1 HDD) are showing up in the BIOS but not in Disk Management. I updated the BIOS to the latest version (F20a) and all the drivers are (to my knowledge) up to date. I've tried all SATA ports and moved the M.2 drive to the other spots but to no avail. Already reinstalled Windows 2 times and the 2 drives in question did not show up during the process. I've tinkered with the BIOS a little bit but some changes cause BSOD on boot (CSM and VMD settings). Am I wrong to assume that if the drives show up in the BIOS they're not DOA ? I haven't tested them in another machine yet... So that's where I'm at right now. Everything else is working perfectly apart from the 2 new drives. Thanks in advance for your time and help ! Specs : 12600K Z690 UD DDR4 32Gb G.Skill Neo Trident Crucial BX100 (working) WD Blue ssd (working) Seagate Ironwolf (not working) Samsung 980pro (not working) Focus GX-550 Windows 10 64bits ver.21H2