[ Ссылка ] 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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