I upgraded from an older AM3+ system to AM5 and moved over a SATA SSD that had been cloned from my previous Windows HDD. It initially booted, but I wanted to perform a clean Windows 11 installation. When I tried launching the installer from the ISO, it said the drive needed to use GPT with UEFI instead of MBR. After deleting a partition and the hibernation file, the conversion still failed because there supposedly wasn't enough space. I then used gdisk to convert the drive to GPT and restarted. Windows no longer boots because there is no EFI boot partition. I also can't use CSM with my current integrated-graphics setup and motherboard configuration. If I create a bootable Windows USB installer, can I reinstall Windows without losing the files currently on the SSD?
3 Answers
The safest approach is to stop modifying the SSD until you have copied off anything important. Connect it to another working computer, or boot a separate operating system from a USB drive, and copy your personal files to another drive. Since you wanted a clean installation anyway, the SSD can then be erased and converted to GPT during Windows Setup before reinstalling. There is no guarantee that the previous installation or partition layout will remain usable after the gdisk conversion, so don’t rely on it as your only copy.
Create a bootable Windows 11 USB on another computer, boot the new system from that USB in UEFI mode, and choose a custom installation. If your files are already backed up, delete the old partitions on the SSD and let Setup create the required EFI, recovery, and Windows partitions automatically. A clean install is generally simpler than trying to repair the current boot configuration, but deleting the partitions will permanently remove the data on them.
Yes, moving the SSD to another working computer is a good way to recover your files, assuming the partition table and filesystem are still readable. You can also use a live Linux USB or a Windows recovery environment to copy data to an external drive. Don’t format or delete partitions until you have verified that the backup opens successfully. MBR-to-GPT conversion itself can sometimes preserve the data, but it does not repair a missing EFI System Partition or protect against mistakes during the reinstall.
So I should connect the SSD to another PC first and copy my files somewhere else before reinstalling?