Convert MBR Disk to GPT Disk in Windows 10  

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  1. Brink
    Posts : 68,995
    64-bit Windows 11 Pro for Workstations
    Thread Starter
       New #20

    zbook said:
    Hi Shawn,

    The MBR to GPT conversion method for Minitool Partition Wizard requires similar prerequisites as in this tutorial:
    Convert Windows 10 from Legacy BIOS to UEFI without Data Loss

    Code:
    Although disks configured with MBR-style partition can have up to four primary partitions, 
for this process to work the disk you want to convert can't have more than three partitions, 
because one allocation is needed to create the new UEFI system partition.
    This was a recent thread in which Mini Tool was not able to be used until the extra partition was deleted:
    One last attempt to change LEGACY to EUFI | Windows 11 Forum

    Please consider updating this tutorial by adding the prerequisites or commenting on the prerequisites in the How to Convert Windows 10 from Legacy BIOS to UEFI without Data Loss tutorial.
    Thank you. Warning now added for this to help.
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  3. churin
    Posts : 180
    W10 22H2 primary, W8.1 secondary
       New #21

    I have a MBR drive on which W10 and W8.1 are installed and selectively boot by switching the active partition.
    I tried EaseUS Partition Master to convert the drive type to GPT and found the W10 still booted but W8.1 did not.

    What utility allows converting the drive type to GPT for the dual boot system as above?
      My Computer
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  4. NavyLCDR
    Posts : 18,432
    Windows 11 Pro
       New #22

    churin said:
    I have a MBR drive on which W10 and W8.1 are installed and selectively boot by switching the active partition.
    I tried EaseUS Partition Master to convert the drive type to GPT and found the W10 still booted but W8.1 did not.

    What utility allows converting the drive type to GPT for the dual boot system as above?
    The reason only W10 still booted was because that is the partition that was marked as active during the MBR to GPT partition so that was the OS that was added to the newly created EFI System Partition. After the conversion was completed, you could have added the Windows 8.1 partition to the boot menu with the bcdboot command.
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  5. churin
    Posts : 180
    W10 22H2 primary, W8.1 secondary
       New #23

    NavyLCDR said:
    The reason only W10 still booted was because that is the partition that was marked as active during the MBR to GPT partition so that was the OS that was added to the newly created EFI System Partition. After the conversion was completed, you could have added the Windows 8.1 partition to the boot menu with the bcdboot command.
    I tried the conversion from MBR to GPT again. But for some reason W8.1 booted instead of W10.
    W10 partition cannot be activated by Disk Management or EaseUS Partition Master. I tried to add W10 to the menu but the situation remains unchanged. I am not sure if I added W10 to the menu correctly. Presently no boot menu is displayed during the boot process.
    Could anyone help me add the W10 to the boot menu?
    A screenshot of the Disk Management as follows:
    Convert MBR Disk to GPT Disk in Windows 10-diskmngmnt.jpg
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  7. zbook
    Posts : 41,480
    windows 10 professional version 1607 build 14393.969 64 bit
       New #24

    Please open a new thread and post the new thread link into this thread.

    In the new thread please run and post share links for:

    a) https://www.tenforums.com/attachment...p_plus_log.bat

    b) https://www.tenforums.com/attachment...iskparinfo.bat

    c) https://www.tenforums.com/attachment...on_mbr2gpt.bat


    Indicate whether you have an external drives with free space.
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  8. NavyLCDR
    Posts : 18,432
    Windows 11 Pro
       New #25

    churin said:
    I tried the conversion from MBR to GPT again. But for some reason W8.1 booted instead of W10.
    W10 partition cannot be activated by Disk Management or EaseUS Partition Master. I tried to add W10 to the menu but the situation remains unchanged. I am not sure if I added W10 to the menu correctly. Presently no boot menu is displayed during the boot process.
    Could anyone help me add the W10 to the boot menu?
    A screenshot of the Disk Management as follows:
    Convert MBR Disk to GPT Disk in Windows 10-diskmngmnt.jpg
    The command (run in a command prompt with admin privileges) would be:
    bcdboot D:\Windows /d /addlast
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  9. churin
    Posts : 180
    W10 22H2 primary, W8.1 secondary
       New #26

    I created a new thread as suggested by zbook. It is in General Support and the title is Dual boot from a single physical drive.
    Convert MBR Disk to GPT Disk in Windows 10

    Your continued participation is appreciated.
      My Computer
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  10. zbook
    Posts : 41,480
    windows 10 professional version 1607 build 14393.969 64 bit
       New #27

    This is a link for the new thread:

    https://www.tenforums.com/general-su...ml#post2414662
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