cannot create EFI system partition. Error: 0x000036B7 when running mbr2gpt.exe Cannot find what this error means

Anonymous
2023-04-20T13:07:21+00:00

On an ACER Aspire A315 laptop, running Windows 10, I'm trying to convert the BIOS from 'Legacy' to 'UEFI'. When I run mbr2gpt.exe I get "cannot create EFI system partition.  Error: 0x000036B7".

Can someone help me please?

Thanks

David

Windows for home | Windows 10 | Settings

Locked Question. This question was migrated from the Microsoft Support Community. You can vote on whether it's helpful, but you can't add comments or replies or follow the question.

0 comments

8 answers

Sort by: Most helpful
Most helpful Newest Oldest
  1. Anonymous
    2024-01-02T16:49:43+00:00

    I can share good news!

    I shrinked the volume size not only by 200 MB but by 2GB via the "Datenträgerverwaltung".

    After this resizing, MBR2GPT worked well...

    Hope it helps also further users...

    Was this answer helpful?

    7 people found this answer helpful.
    0 comments
  2. DaveM121 936.3K Reputation points Independent Advisor
    2023-04-20T13:40:52+00:00

    Hi David,

    I am Dave, I will help you with this.

    Right click your Start Button, and from the resulting menu, open Disk Management

    Then right click the C drive partition and choose 'Shrink'

    Shrink that partition by 200MB

    Then try running mbr2gpt again to see if it is successful.

    Was this answer helpful?

    3 people found this answer helpful.
    0 comments
  3. Anonymous
    2024-01-18T20:43:01+00:00

    You can also boot into WinRE and run "mbr2gpt /convert"

    Press F8 during boot > repair your computer > Troubleshoot > open CMD prompt > mbr2gpt /convert

    *Disclaimer*

    When you use mbr2gpt, this will likely add an EFI partition to the right side of the C: drive. This will prevent you from expanding your C: drive unless you use a 3rd party tool to move the EFI partition.

    Was this answer helpful?

    2 people found this answer helpful.
    0 comments
  4. DaveM121 936.3K Reputation points Independent Advisor
    2023-04-20T15:15:08+00:00

    Hi David,

    mbr2gpt is a good tool, but it does fail a lot, if the disk is unbootable after those commands, then that disk cannot be successfully converted, you will not be able to use mbr2gpt, you will have to clean install Windows onto a a drive with a GPT partition style.

    Was this answer helpful?

    1 person found this answer helpful.
    0 comments
  5. Anonymous
    2023-04-20T15:02:26+00:00

    Hi Dave,

    Many thanks for your prompt reply; I carried out your instructions but still got the same error after the following lines:

    Attempting to convert disk 0

    Retrieving layout of disk

    Validating layout, disk sector size is: 512 bytes

    Backing up the system partition

    Creating the EFI system partition

    After is has failed, the disk is unbootable so I have to clone it from another 'Master' HDD.

    Any other suggestions please?

    David

    Was this answer helpful?

    1 person found this answer helpful.
    0 comments