Windows 10: Mbr2gpt partition failure... cant get usb to boot to reinstall windows

Discus and support Mbr2gpt partition failure... cant get usb to boot to reinstall windows in Windows 10 Software and Apps to solve the problem; Long story short we all know why I did an mbr2gpt conversion. Microsoft is stopping support for windows 10 and my device supports secure boot but the... Discussion in 'Windows 10 Software and Apps' started by Simon Hensley, Oct 13, 2024.

  1. Mbr2gpt partition failure... cant get usb to boot to reinstall windows


    Long story short we all know why I did an mbr2gpt conversion. Microsoft is stopping support for windows 10 and my device supports secure boot but the windows install for windows 10 was mbr not gpt. In order to continue receiving security updates and support I wanted to get secure boot to get windows 11 without bypassing the need for secure boot.Now the issue- after having done the mbr2gpt the cmd prompt said conversion was successful. I went to restart and set up my bios for csm to be disabled and turn on secure boot but after hitting save and exit the pc will stay on bios logo and says "pr

    :)
     
    Simon Hensley, Oct 13, 2024
    #1
  2. thraxed Win User

    Installing windows off of a USB stick

    Step By Step from vista:
    From admin cmd prompt

    1. diskpart
    1a. list disk
    2. select disk 1 (replace 1 with your usb drive)
    3. clean
    4. create partition primary
    5. select partition 1 (replace 1 with your usb drive)
    6. active
    7. format fs=fat32
    8. assign
    9. exit

    Copy Windows Vista's DVD ROM content to the Flash Drive

    xcopy d:\*.* /s/e/f e:\ (d being your vista cd and e being your usb stick)

    And that's it, boot off your usb disk
     
    thraxed, Oct 13, 2024
    #2
  3. NavyLCDR Win User
    MBR2GPT Error - Frustrated

    I think those steps will fail because mbr2gpt is looking for a system partition, which you just deleted previously.
     
    NavyLCDR, Oct 13, 2024
    #3
  4. Mbr2gpt partition failure... cant get usb to boot to reinstall windows

    MBR2GPT: ValidateLayout: Too many MBR partitions found, no room to create EFI system partition.

    I deleted the inactive recovery partition.

    Then I ran the mbr2gpt conversion command. It was successful but I got below error:

    C:\WINDOWS\system32>mbr2gpt /convert /disk:2 /allowfullos

    MBR2GPT will now attempt to convert disk 2.
    If conversion is successful the disk can only be booted in GPT mode.
    These changes cannot be undone!

    MBR2GPT: Attempting to convert disk 2
    MBR2GPT: Retrieving layout of disk
    MBR2GPT: Validating layout, disk sector size is: 512 bytes
    MBR2GPT: Trying to shrink the OS partition
    MBR2GPT: Creating the EFI system partition
    MBR2GPT: Installing the new boot files
    MBR2GPT: Performing the layout conversion
    MBR2GPT: Migrating default boot entry
    MBR2GPT: Adding recovery boot entry
    MBR2GPT: Fixing drive letter mapping
    MBR2GPT: Conversion completed successfully
    Call WinReReapir to repair WinRE
    MBR2GPT: Failed to update ReAgent.xml, please try to manually disable and enable WinRE.
    MBR2GPT: Before the new system can boot properly you need to switch the firmware to boot to UEFI mode!


    So when I try to manually disable and enable winRE, I get below error:

    REAGENTC.EXE: The Windows RE image was not found.

     
    krishna chaitanya r p, Oct 13, 2024
    #4
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Mbr2gpt partition failure... cant get usb to boot to reinstall windows

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