Convert Windows 10 from Legacy BIOS to UEFI without Data Loss  

Page 5 of 31 FirstFirst ... 3456715 ... LastLast

  1. Posts : 61,457
    64-bit Windows 11 Pro for Workstations
    Thread Starter
       #40

      My Computers


  2. Posts : 675
    Windows 10 x64
       #41

    Just to make sure:
    Motherboard: X99

    Currently: Windows 10 x64 15063.296
    Legacy BIOS.
    Convert Windows 10 from Legacy BIOS to UEFI without Data Loss-snagit-22052017-140526.png

    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

    Convert Windows 10 from Legacy BIOS to UEFI without Data Loss-snagit-22052017-154941.png

    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 Computer


  3. Posts : 61,457
    64-bit Windows 11 Pro for Workstations
    Thread Starter
       #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 Computers


  4. Posts : 675
    Windows 10 x64
       #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 Computer


  5. Posts : 61,457
    64-bit Windows 11 Pro for Workstations
    Thread Starter
       #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 Computers


  6. Posts : 675
    Windows 10 x64
       #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 Computer


  7. Posts : 675
    Windows 10 x64
       #46

    Matter solved, thanks!

    FWIW ...

    [Screenshot 1]
    From admin command prompt

    mbr2gpt /validate /allowFullOS

    and then:

    mbr2gpt /convert /allowfullOS


    Convert Windows 10 from Legacy BIOS to UEFI without Data Loss-convert-mbr-gpt-enable-uefi-01-23052017-142751.png

    =
    [Screenshot 2]
    From admin command prompt

    Diskpart
    List Disk


    shows the converted drive (disk 1)

    Convert Windows 10 from Legacy BIOS to UEFI without Data Loss-convert-mbr-gpt-enable-uefi-02-23052017-145558.png

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

    Convert Windows 10 from Legacy BIOS to UEFI without Data Loss-convert-mbr-gpt-enable-uefi-03-23052017-145037.png

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

    Convert Windows 10 from Legacy BIOS to UEFI without Data Loss-convert-mbr-gpt-enable-uefi-05-23052017-145715.png

    =
    [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)

    Convert Windows 10 from Legacy BIOS to UEFI without Data Loss-convert-mbr-gpt-enable-uefi-04-23052017-130403.png
    =

    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 Computer


  8. Posts : 61,457
    64-bit Windows 11 Pro for Workstations
    Thread Starter
       #47

    Great news tfwul.
      My Computers


  9. Posts : 13,536
    Windows10
       #48

    tfwul said:
    Matter solved, thanks!

    FWIW ...

    [Screenshot 1]
    From admin command prompt

    mbr2gpt /validate /allowFullOS

    and then:

    mbr2gpt /convert /allowfullOS


    Convert Windows 10 from Legacy BIOS to UEFI without Data Loss-convert-mbr-gpt-enable-uefi-01-23052017-142751.png

    =
    [Screenshot 2]
    From admin command prompt

    Diskpart
    List Disk


    shows the converted drive (disk 1)

    Convert Windows 10 from Legacy BIOS to UEFI without Data Loss-convert-mbr-gpt-enable-uefi-02-23052017-145558.png

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

    Convert Windows 10 from Legacy BIOS to UEFI without Data Loss-convert-mbr-gpt-enable-uefi-03-23052017-145037.png

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

    Convert Windows 10 from Legacy BIOS to UEFI without Data Loss-convert-mbr-gpt-enable-uefi-05-23052017-145715.png

    =
    [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)

    Convert Windows 10 from Legacy BIOS to UEFI without Data Loss-convert-mbr-gpt-enable-uefi-04-23052017-130403.png
    =

    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 Computer


  10. Posts : 25
    Windows 10 Home 1703
       #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 Computer


 

Tutorial Categories

Convert Windows 10 from Legacy BIOS to UEFI without Data Loss Tutorial Index Network & Sharing Instalation and Upgrade Browsers and Email General Tips Gaming Customization Apps and Features Virtualization BSOD System Security User Accounts Hardware and Drivers Updates and Activation Backup and Restore Performance and Maintenance Mixed Reality Phone


  Related Discussions
Our Sites
Site Links
About Us
Windows 10 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 10" and related materials are trademarks of Microsoft Corp.

Designer Media Ltd
All times are GMT -5. The time now is 03:00.
Find Us




Windows 10 Forums