What I don't understand is that the conversion is failing even though I've reinstalled Windows and checked that everything is at it should be.
WHY WINDOWS CREATE EFI SYSTEM PARTITION HOW TO
I've read heaps of guides on how to overcome MBR2GPT errors, some of the proposed solutions are terribly convoluted and none seem to help. I guess I could remove the drive first (before restoring the image) and connect it externally via SATA to USB adaptor to grab those log files but, honestly, it's not really worth the effort. Then I restore a system image to that drive and, of course, those log files are overwritten. The "Failed to create EFI partition" error happens during the conversion phase (toward the end) and renders the operating system unbootable. At that stage there is no point in going any further until you've sorted out why the drive is failing validation- my drive is not failing validation. If your disk already contains an ESP (eg if your computer had Windows 8 preinstalled), it can be used for Ubuntu too. Article ContentRight-click This PC and select Manage.Open Disk Management.Select the disk from which you want to make a partition. This partition holds EFI-mode boot loaders and related files. It will fail validation if the system drive doesn't meet certain requirements, including having no more than 3 partitions. If you are manually partitioning your disk in the Ubuntu installer, you need to make sure you have an EFI System Partition (ESP) set up.
On the face of it, there appears no reason why the conversion should not complete, the MBR system drive has just 3 partitions and everything else seems to meet the criteria. I have a system image backup on hand so it's been a tiresome process of trying things and then restoring the backup when it doesn't work.Ĭommands: mbr2gpt /validate and then mbr2gpt /convert In Advanced Mode > Command Prompt, validation is always successful but, when I input the command to convert, it gets so far and then the message "Failed to create EFI partition" and the system drive will not boot. Everything seems fine- "sfc /scannow" reports zero corruptions and "Dism /Online /Cleanup-Image /RestoreHealth" completes successfully with no errors.
WHY WINDOWS CREATE EFI SYSTEM PARTITION INSTALL
In the end I performed a repair install via Windows 10 ISO. I've been battling away with this for days now and it's driving me crazy- trying to convert an MBR system drive to GPT. Windows 10 Pro 21H1 - Samsung SSD 850 EVO 250 GB with 173 GB free space (perfectly healthy according to Samsung Magician)
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