If the WD Black SN770 is not recognised as a system drive on the Gigabyte H610M S2H V3 DDR4 motherboard, follow these steps to resolve the issue:

1. Check Compatibility
The WD Black SN770 is an NVMe PCIe 4.0 SSD. The Gigabyte H610M S2H V3 DDR4 supports NVMe PCIe 3.0 on the M.2 slot. The SSD should work, but will operate at PCIe 3.0 speeds.
Make sure the SSD is inserted in the correct M.2 slot (if your card has more than one).
2. Check the BIOS
Enter the BIOS by pressing DEL at startup.
Go to BIOS → Storage Configuration and check if the WD Black SN770 is recognized.
Check if the SSD is set as the first boot device in Boot Priority.
If the BIOS does not see it, try:
Reset the BIOS to default values (Load Optimized Defaults).
Update the BIOS to the latest version from the Gigabyte website.
3. Disk Configuration
If the SSD is visible in the BIOS but not detected during Windows installation:

Boot Windows from a USB stick.
Open the Command Prompt (Shift + F10 in the Windows installer) and type:
nginx
Copy code
diskpart
list disk
If the disk appears but does not have a partition
pgsql
Copy code
select disk X (replace X with the number of your SSD)
clean
convert gpt
create partition primary
format fs=ntfs quick
exit
Retry the Windows installation.
4. Check the controller mode in the BIOS
In the BIOS, go to Settings → Advanced → SATA Configuration and set M.2 Mode to NVMe if possible.
Check if CSM (Compatibility Support Module) is disabled, and Secure Boot is enabled to support UEFI.
5. Try another slot or another PC
If the WD Black SN770 is not detected, try installing it on another PC or use an NVMe → USB adapter to verify that the SSD will work.

Oh yes...Windows 10 Pro, I can see the disc in the system, but cannot boot from the SSD....