Cannot create EFI system partition. Error: 0x000036B7 when running mbr2gpt.exe

Anonymous
2025-06-20T00:49:27+00:00

I've seen similar posts about this but was not enough for me to resolve my issue.

Windows for home | Windows 10 | Install and upgrade

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Ramesh 183.6K Reputation points Volunteer Moderator
2025-06-20T04:00:12+00:00

The error code (0x80070057) during the format operation can be caused by a bad disk.

Anyway, let's try converting to GPT via WinRE.

Create a USB setup disk.

https://support.microsoft.com/en-us/windows/create-installation-media-for-windows-99a58364-8c02-206f-aa6f-40c3b507420d

Boot from the USB setup disk and access WinRE.

In WinRE Command Prompt, run MBR2GPT. https://answers.microsoft.com/en-us/windows/forum/all/convert-an-existing-windows-10-installation-from/aa8c2de3-460b-4a8c-b30b-641405f800d7

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  1. Anonymous
    2025-06-20T02:28:40+00:00

    Ok, so I tried your method. I was unable to change active partition to C. I was also not able to delete partition V.

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  2. Ramesh 183.6K Reputation points Volunteer Moderator
    2025-06-20T01:57:05+00:00

    From admin Command Prompt, run:

    bcdboot C:\Windows /s C:

    If that command runs correctly, right-click volume C: and mark it as the active partition.

    Restart Windows and delete the V:\ drive and merge the free space with C.

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