Converting from MBR to GPT (OS already installed)
Is it possible to convert a SSD disk that already has Windows 10 on its first partition from MBR to GPT so that the OS is still bootable?
I want to place another iteration of Windows 10 on an empty partition of that disk by installing Win7 onto the empty partition and then letting it free upgrade to Win10. But the Windows 7 OEM System Builder Pack that I bought when I built my computer won't allow the installation because I am using UEFI boot mode and my SSD is MBR. Microsoft’s error message says the disk I want to install to needs to be GPT because my computer is in UEFI mode (which I wish to retain).
I spent a lot of time getting my present Win7 OS fully installed, updated and configured and would be unhappy if I need to start over reinstalling after the conversion. Is there a non-destructive method to do such a conversion so that my present Windows 10 on the first partition is still bootable?
I have a good Acronis backup of the Win 10 OS on this disk. Alternatively, would it work to delete all partitions, convert the MBR disk to GPT, then restore the OS from my backup? Or is it not possible to restore a bootable OS backup from an MBR disk to a GPT disk because of partitioning issues having to do with possibly different ways that boot sectors are handled in MBR and GPT?