I am trying to move my windows 8.1 OS partition to a second HDD. I will try to explain what I have tried so far.
I started with a Windows 8.1 installation on a SSD (120GB). I have also an HDD of 500GB in the laptop that I used for data. Then I installed Windows 10 in Dual Boot on the SSD which worked fine. However, the SSD was to small for both OS's, so I tried to copy my Windows 8.1 partition to the HDD. And added the new partition tot the bootmanager (bootrec /rebuildbcd). When I try to boot the new OS entry in the bootmanager, the startup repair automatically starts up and shows a message that it was unable to repair the startup.
Then I tried to migrate the Windows 8.1 partition to the HDD by using the migrate HDD/SSD option of EaseUS partition master, which copied both the system partition and Windows 8.1 OS partition to the HDD. Then I ran bootrec /rebuildbcd again, but with the same results.
I have no idea what to try next. Has anyone a suggestion on what I can try now?