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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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  1. Ramesh Srinivasan 173.9K 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. Ramesh Srinivasan 173.9K Reputation points Volunteer Moderator
    2025-06-20T03:31:19+00:00

    Have you tried the other option I mentioned?

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  2. Anonymous
    2025-06-20T03:48:36+00:00

    Yes, I tried. I get same error.

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  3. Anonymous
    2025-06-20T04:32:35+00:00

    I put windows 10 onto a usb and booted from it. I was able to get to Command Prompt, but could not validate disk

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  4. Ramesh Srinivasan 173.9K Reputation points Volunteer Moderator
    2025-06-20T04:39:05+00:00

    What if you mention the disk # (i.e., disk 0)?

    mbr2gpt.exe /validate /disk:0

    MBR2GPT | Microsoft Learn: https://learn.microsoft.com/en-us/windows/deployment/mbr-to-gpt

    /disk: Specifies the disk number of the disk to be converted to GPT. If not specified, the system disk is used. The mechanism used is the same as used by the diskpart.exe tool SELECT DISK SYSTEM command.
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