I upgraded from Windows 8.1 to Windows 10. The W10 does not recognize my 2nd harddrive (no issues with W8.1). The drive is recognized in BIOS but does not show at all in W10 Disk Management. My primary drive as Disk 0 then my USB drives. No 2nd hard drive.
So I've started in Safe Mode but have the same issue, no 2nd hard drive.
Is there a fix available? Or maybe it is possible that a service is not running?
Any help is appreciated.

Please help.

I did not find the right solution from the internet.

References: -
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