Windows 10: mbr2gpt fails with "Cannot find room for the EFI system partition."

Greetings. As Windows 11 comes close to it's release, I thought I'd start preparations in advance. My PC is fully compliant with Windows 11, however my disks all have MBR partition instead of GPT so I wanted to convert it as soon as possible. However, I hadn't had any luck with using mbr2gpt utility, it always fails with "Cannot find room for the EFI system partition." error. I searched for solution several times and yet to succeed. In my PC I have two disks: with ID 0 is a RAID0 array I think I have an Intel RAID controller in my motherboard, so it's not software RAID of two HDDs, it's show

:)

 

MBR2GPT fails with error - Cannot find room for the EFI system partition.

Regarding this image, which partition should I extend?

The problem wasn't that I didn't have enough space to update, it was the MBR2GPT error: "cannot find room for the EFI system partition"

 

MBR2GPT fails with error - Cannot find room for the EFI system partition.

Hi,

Would love to get some help

I'm trying to install the new Win10 update but then I get this error: "windows can't be installed because this pc has an unsupported disk layout for UEFI firmware"

Afterward I run MBR2GPT run it in WINPE but I get this error: "cannot find room for the EFI system partition"

I have two partitions on this disk: 1. System. 2. Recovery and 100mb unallocated.

When I try to shrink volume on Disk Management I get 0 size of available shrink space in MB.

The disk has plenty of free space though.

Any ideas?

 

MBR2GPT fails with error - Cannot find room for the EFI system partition.

Have you tried running MBT2EFI while in Windows? Normally, the System EFI partition will be placed after the OS partition. If the utility cannot shrink the C partition, it may not be able to add that partition. You do only have 58 GB free in C so I can
see why it might have problems.

It also has to add an MSR partition which is probably 16 MB so there may not be enough room in the 101 MB partition, but just guessing.