Windows 10: Convert Windows 10 from Legacy BIOS to UEFI without Data Loss  

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  1. Posts : 27,232
    64-bit Windows 10 Pro build 17604
    Thread Starter
       06 May 2017 #40

      My ComputersSystem Spec

  2.    22 May 2017 #41

    Just to make sure:
    Motherboard: X99

    Currently: Windows 10 x64 15063.296
    Legacy BIOS.
    Click image for larger version. 

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    2 SSD's and multiple HDD's

    1st SSD is Disk 1 = Windows
    2nd SSD is Disk 2

    rest are HDD's
    Disk 0 is also MBR
    Disk 7 is an encrypted container

    Click image for larger version. 

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    Questions:
    - should I convert all 3 MBR disks?
    - in case I convert disk 2, (containing Windows) how will it then handle the reserved unallocated SSD space ?
    Assume it will remain untouched.
    - on disk 3 (SSD) obviously there is also a reserved space
    - should I run two separate commands

    a) MBR2GPT /validate /disk:2 /logs:d:\
    and then
    b) MBR2GPT convert /disk:2 /logs:d:\ /allowFullOS

    or
    MBR2GPT convert /disk:2 /logs:d:\ /allowFullOS /validate

    Thanks!
    =
      My ComputerSystem Spec


  3. Posts : 27,232
    64-bit Windows 10 Pro build 17604
    Thread Starter
       22 May 2017 #42

    Hello @tfwul,

    You can run the command below in an elevated command prompt while in Windows to validate and see if it will be able to convert your Windows installation to UEFI or not.

    mbr2gpt /validate /allowFullOS

    If it says it's able to, then you can run the command below to convert.

    mbr2gpt /convert /allowfullOS
      My ComputersSystem Spec

  4.    22 May 2017 #43

    Thanks again. BTW, as always, the very last thing before applying upgrades is creating a image (Macrium), so I can always revert to a working Windows. I wonder, images created in the legacy BIOS/MBR mode, would it be possible to restore them after conversion.
    Really wouldn't know.

    Assume media creation tool will not be able create a UEFI USB thumbdrive?
    (I need Rufus for that?)
    or will mediacreation tool 'see/recognize' an UEFI system and then thus create an UEFI USB thumbdrive.


    =
      My ComputerSystem Spec


  5. Posts : 27,232
    64-bit Windows 10 Pro build 17604
    Thread Starter
       22 May 2017 #44

    Creating a Macrium image first would be a good idea. If you should need to restore it, it'll restore it back to how it was when the image was created.

    You don't need installation media to do this conversion, but it would be handy to have in the future though. You can use any option below to create a UEFI USB.

    Create Bootable USB Flash Drive to Install Windows 10 Windows 10 Installation Upgrade Tutorials
      My ComputersSystem Spec

  6.    23 May 2017 #45

    I will do this conversion once I know .. if.., and if so, where and what exactly I also need to change in the BIOS of my Asus x99 DeLuxe/U3.1
    It seems I should go into the BIOS settings as well and should change 'something, somewhere in some screen'. Have spent quite a bit of time trying to figure this out.

    I'll continue searching.

    =
      My ComputerSystem Spec

  7.    23 May 2017 #46

    Matter solved, thanks!

    FWIW ...

    [Screenshot 1]
    From admin command prompt

    mbr2gpt /validate /allowFullOS

    and then:

    mbr2gpt /convert /allowfullOS


    Click image for larger version. 

Name:	Convert MBR to GPT and enable UEFI-01-23052017 142751.png 
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Size:	64.6 KB 
ID:	136311

    =
    [Screenshot 2]
    From admin command prompt

    Diskpart
    List Disk


    shows the converted drive (disk 1)

    Name:  Convert MBR to GPT and enable UEFI-02-23052017 145558.png
Views: 1210
Size:  52.6 KB

    =
    [Screenshot 3]
    Run msinfo32
    shows that now UEFI is enabled to boot from.

    Click image for larger version. 

Name:	Convert MBR to GPT and enable UEFI-03-23052017 145037.png 
Views:	58 
Size:	38.2 KB 
ID:	136313

    =
    [Screenshot 4]
    run dskmgmt
    before and after - shows an extra partition

    Name:  Convert MBR to GPT and enable UEFI-05-23052017 145715.png
Views: 1166
Size:  14.5 KB

    =
    [Screenshot 5]
    Motherboard BIOS (Asus X99 DeLuxe/U3.1)
    select Boot section in BIOS
    select CSM
    select Enabled
    select UEFI and legacy OpROM

    'Enabled' and 'UEFI and legacy OpROM' were already selected in my case)
    (tried UEFI only, but that disables the keyboard)

    Name:  Convert MBR to GPT and enable UEFI-04-23052017 130403.png
Views: 1191
Size:  84.8 KB
    =

    Small note:
    In my case the steps outlined in "How to Boot to UEFI Firmware Settings from inside Windows 10" didn't work.
    Start->Settings->Update & Security->Recovery->Restart Now (Advanced Startup)->Troubleshoot->Advanced Options...

    from this point on Windows restarted ("Please Wait" and "Turning off your computer"), instead of 'Startup settings",
    instead of getting "UEFI Firmware Settings".

    Anyway, matter solved.
      My ComputerSystem Spec


  8. Posts : 27,232
    64-bit Windows 10 Pro build 17604
    Thread Starter
       23 May 2017 #47

    Great news tfwul.
      My ComputersSystem Spec

  9.    23 May 2017 #48

    tfwul said: View Post
    Matter solved, thanks!

    FWIW ...

    [Screenshot 1]
    From admin command prompt

    mbr2gpt /validate /allowFullOS

    and then:

    mbr2gpt /convert /allowfullOS


    Click image for larger version. 

Name:	Convert MBR to GPT and enable UEFI-01-23052017 142751.png 
Views:	125 
Size:	64.6 KB 
ID:	136311

    =
    [Screenshot 2]
    From admin command prompt

    Diskpart
    List Disk


    shows the converted drive (disk 1)

    Name:  Convert MBR to GPT and enable UEFI-02-23052017 145558.png
Views: 1210
Size:  52.6 KB

    =
    [Screenshot 3]
    Run msinfo32
    shows that now UEFI is enabled to boot from.

    Click image for larger version. 

Name:	Convert MBR to GPT and enable UEFI-03-23052017 145037.png 
Views:	58 
Size:	38.2 KB 
ID:	136313

    =
    [Screenshot 4]
    run dskmgmt
    before and after - shows an extra partition

    Name:  Convert MBR to GPT and enable UEFI-05-23052017 145715.png
Views: 1166
Size:  14.5 KB

    =
    [Screenshot 5]
    Motherboard BIOS (Asus X99 DeLuxe/U3.1)
    select Boot section in BIOS
    select CSM
    select Enabled
    select UEFI and legacy OpROM

    'Enabled' and 'UEFI and legacy OpROM' were already selected in my case)
    (tried UEFI only, but that disables the keyboard)

    Name:  Convert MBR to GPT and enable UEFI-04-23052017 130403.png
Views: 1191
Size:  84.8 KB
    =

    Small note:
    In my case the steps outlined in "How to Boot to UEFI Firmware Settings from inside Windows 10" didn't work.
    Start->Settings->Update & Security->Recovery->Restart Now (Advanced Startup)->Troubleshoot->Advanced Options...

    from this point on Windows restarted ("Please Wait" and "Turning off your computer"), instead of 'Startup settings",
    instead of getting "UEFI Firmware Settings".

    Anyway, matter solved.
    For clarity, you can only change UEFI settings if already booted to UEFI. If booted as legacy bios, that option does not exist.
      My ComputerSystem Spec

  10.    10 Jun 2017 #49

    It's about time Windows included this tool. Worked perfectly for me. I was searching the internet for a way to do this without having to wipe my OS drive and re-partition or purchasing a pro version of a partitioning tool.
      My ComputerSystem Spec


 
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