Ten první HDD dočasně odpoj a Windows nainstaluj na ten druhý HDD z HDD:
https://www.itnetwork.cz/windows/tutorial-instalace-windows-z-hdd
nebo si to tam nahaž ručně:
https://docs.microsoft.com/en-us/windows-hardware/manufacture/desktop/configure-uefigpt-based-hard-drive-partitions
https://docs.microsoft.com/en-us/windows-hardware/manufacture/desktop/configure-biosmbr-based-hard-drive-partitions
https://docs.microsoft.com/en-us/windows-hardware/manufacture/desktop/windows-deployment-sample-scripts-sxs