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  1.    06 May 2017 #40
    Join Date : Oct 2013
    Posts : 25,194
    64-bit Windows 10 Pro build 17040
    Thread Starter

      My ComputersSystem Spec
  2.    22 May 2017 #41
    Join Date : Oct 2014
    Posts : 207
    Windows 10 x64

    Just to make sure:
    Motherboard: X99

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

Name:	SnagIt-22052017 140526.png 
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Size:	47.5 KB 
ID:	136184

    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. 

Name:	SnagIt-22052017 154941.png 
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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.    22 May 2017 #42
    Join Date : Oct 2013
    Posts : 25,194
    64-bit Windows 10 Pro build 17040
    Thread Starter

    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
    Join Date : Oct 2014
    Posts : 207
    Windows 10 x64

    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.    22 May 2017 #44
    Join Date : Oct 2013
    Posts : 25,194
    64-bit Windows 10 Pro build 17040
    Thread Starter

    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
    Join Date : Oct 2014
    Posts : 207
    Windows 10 x64

    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
    Join Date : Oct 2014
    Posts : 207
    Windows 10 x64

    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:	91 
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: 845
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:	43 
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: 825
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: 835
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.    23 May 2017 #47
    Join Date : Oct 2013
    Posts : 25,194
    64-bit Windows 10 Pro build 17040
    Thread Starter

    Great news tfwul.
      My ComputersSystem Spec
  9.    23 May 2017 #48
    Join Date : Dec 2015
    Posts : 5,897
    Windows10

    Quote Originally Posted by tfwul 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:	91 
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: 845
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:	43 
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: 825
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: 835
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
    Join Date : May 2017
    Posts : 23
    Windows 10 Home 1703

    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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