You’ve likely found this page because you have a Windows virtual machine that has low space on the C: drive. You added more space to the VM using your hypervisor administration tool but when you log into the VM to try and extend the C: drive, you find yourself confronted with the problem below:

The EFI System partition is sitting between your C: drive and your free space meaning that the “Extend” option on the C: drive is greyed out. Well crap, now what?

I spent a lot of time Googling this but I never found a satisfactory answer. Most of what I did find involved dealing with the recovery partition being to the right of the C: drive and doing various things to remove it.

The problem is we can’t remove the EFI System partition as it’s required for Windows to boot. We somehow need to move the EFI system partition from the right side of the C: drive to the left. But how?

Below are the steps I’ve found that have worked for me. Of course, this information is provided as-is. Ensure you have complete backups of your drive before proceeding.