HOW TO FIX: Windows 10/11 won't boot without second harddrive
https://www.buymeacoffee.com/benjamintv So you need to put back the second HDD first otherwise this won't work, or you have to do this from windows recovery if you have a usbstick with windows 10/11.
From start type, CMD then run as administrator
Diskpart
List volume
check if C: is really the one you want
EXIT Diskpart
Type:
bcdboot C:\windows /s C:
Press enter en it will say boot files are created.
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