mbr2gpt

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  1. Posts : 16
    Windows 10 Enterprise
       #1

    mbr2gpt


    Evening all , I recently bought a new harddrive , I tried to convert using this method as it said the conversion rate was rapid taking only seconds . I must have done it wrong because my drive still shows 1.99TB and 2.93MB can someone please tell me how to complete the conversion . thank you .mbr2gpt-conversiopn-failed-uefi-mode.jpg
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  2. Posts : 16
    Windows 10 Enterprise
    Thread Starter
       #2

    That last photo was a photo of Command Prompt (Admin ) , and the reason it failed here is a photo of my hard drive .mbr2gpt-new-drive.jpg
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  3. topgundcp's Avatar
    Posts : 2,616
    MintMate19x64 Win10Prox64
       #3

    look like you are running the command while Windows is running. You must boot the PC into Windows Recovery environment.
    To boot into the Recovery: Hold down SHIFT key->Start->Power->Restart then try the command again.

    NOTE: The command will also fail if your current Windows disk layout is not configured correctly.
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  4. NavyLCDR's Avatar
    Posts : 13,232
    Windows 10 Pro
       #4

    The error is the disk layout failed. We would need to see a screenshot of disk management:
    Disk Management - How to Post a Screenshot of | Windows 10 Tutorials

    More info on mbr2gpt:
    MBR2GPT | Microsoft Docs

    It can be run from within Windows with the /allowFullOS option.
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  5. cereberus's Avatar
    Posts : 11,346
    Windows10
       #5

    NavyLCDR said:
    The error is the disk layout failed. We would need to see a screenshot of disk management:
    Disk Management - How to Post a Screenshot of | Windows 10 Tutorials

    More info on mbr2gpt:
    MBR2GPT | Microsoft Docs

    It can be run from within Windows with the /allowFullOS option.
    Yeah usual reason is drive already has four primary partitions. It has to create an EFI partition so original drive can only have three. In general, if mbr drive has a separate system partition (as most do), then you can delete that first, then run mbr2gpt. I am pretty sure you can only do this when booting from an windows 10 installation drive, using mbr2gpt offline (using diskpart).
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  6. Posts : 16
    Windows 10 Enterprise
    Thread Starter
       #6

    NavyLCDR Is this what you want .mbr2gpt-disk-management.jpg
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  7. NavyLCDR's Avatar
    Posts : 13,232
    Windows 10 Pro
       #7

    Your computer is already booting in UEFI mode which means the drive is probably already in GPT format. What makes you think it isn't?

    What does diskpart, list disk show?

    mbr2gpt-capture.jpg
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  8. Plankton's Avatar
    Posts : 1,663
    Windows 10 Pro
       #8

    NettleWarbler said:
    NavyLCDR Is this what you want .mbr2gpt-disk-management.jpg
    Wow....what size HDD is that? I see that part of it is unallocated.....which may be part of your issue.
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  9. NavyLCDR's Avatar
    Posts : 13,232
    Windows 10 Pro
       #9

    Plankton said:
    Wow....what size HDD is that?
    According to the screenshot it's a 1TB hard drive.
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  10. Plankton's Avatar
    Posts : 1,663
    Windows 10 Pro
       #10

    Can't be...maybe a 10GB. The unallocated states 7266.00 GB and C is 2047.05 GB...which is a grand total of 9313.05 GB.


    I can't read or see....not sure which. You're right 1TB.
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