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  1.    09 Apr 2017 #11
    Join Date : Mar 2016
    Posts : 467
    Windows 10 Home

    Quote Originally Posted by dortmunder View Post
    My mobo has the option of UEFI or BIOS. My system is currently BIOS. If I clean install and want to have UEFI then am I right in saying that I need to enter the BIOS, change boot order to 'USB' and set it to UEFI?
    This afternoon I used a USB drive to clean installed 1703 in UEFI mode (for the first time), and I had to set 'Windows Boot Manager' as the first boot device after the installation. Luckily, all files in drive D: remained there after I converted MBR to GPT.

    Quote Originally Posted by NavyLCDR View Post
    Yes, the MCT will create a USB flash drive that will work in both UEFI and legacy BIOS computers.
    I created a bootable USB drive without using MCT according to
    How to make active@boot disk bootable on uefi/gpt? - Solved - Windows 10 Forums
    You were one of those who answered my questions there. Thanks a lot!
      My ComputerSystem Spec
  2.    09 Apr 2017 #12
    Join Date : Jul 2015
    Posts : 9,390
    Windows 10 Pro

    You have to be careful how you convert a drive containing a data partition from MBR to GPT and to keep your data a third party program like MiniTool Partition Wizard must be used. If you use the Windows standard diskpart commands, the physical drive must be erased entirely and the normal sequence of commands is "clean" followed by "convert gpt". The clean command wipes all the partitions off the drive.
      My ComputerSystem Spec
  3.    09 Apr 2017 #13
    Join Date : Feb 2017
    Posts : 63
    Windows 10 Enterprise 2015 LTSB x64

    Quote Originally Posted by dortmunder View Post
    "...and also make the usb bootable to UEFI (GPT) when you make the bootable usb." The Media Creation Tool makes no mention of this, it's just a case of choosing USB or disc and then the Tool goes ahead and does it. Does the Tool automatically give you a UEFI compatible USB/disc does anyone know?
    That's if you use Rufus, did not see you we're using the MS tool.
      My ComputerSystem Spec
  4.    09 Apr 2017 #14
    Join Date : Mar 2016
    Posts : 467
    Windows 10 Home

    Quote Originally Posted by NavyLCDR View Post
    MiniTool Partition Wizard must be used.
    I used neither MiniTool Partition Wizard nor Diskpart to convert my HDD from MBR to GPT.
    I used Gdisk on a Linux Live DVD instead, as I had already mentioned in this post last month.
    My data partition remains safe and sound.

    Quote Originally Posted by NavyLCDR View Post
    You have to be careful how you convert a drive containing a data partition from MBR to GPT and to keep your data
    I don't have to be careful because I already did it successfully.

    Quote Originally Posted by anonjwm View Post
    That's if you use Rufus, did not see you we're using the MS tool.
    I used neither to create my bootable USB drive.
      My ComputerSystem Spec
  5.    10 Apr 2017 #15
    Join Date : Mar 2017
    Posts : 69
    Windows 10
    Thread Starter

    A quick recap then, if I may. To clean-install a UEFI based Win10 on a BIOS based Win10 I need to:

    Use Media Creation Tool to make a bootable USB stick. (The MCT will create a USB flash drive that will work in both UEFI and legacy BIOS computers.)

    Go into the BIOS and A) change boot order to USB drive and B) change its settings to UEFI.
    Start the installation.

    When prompted, allow the change to GPT. (As it is a clean-install, and the SSD is only for the OS,I'm not concerned about losing data so no need for a third party program like MiniTool Partition Wizard).

    Does that sound right? Thanks for your time.
      My ComputerSystem Spec
  6.    10 Apr 2017 #16
    Join Date : Jul 2015
    Posts : 3,714
    10 Pro

    Sounds good except for this bit...

    Quote Originally Posted by dortmunder View Post
    When prompted, allow the change to GPT. .
    The installation doesn't actually prompt you to change to GPT.

    When you get to the bit during the installation that says "Where do you want to install Windows?" remove all the partitions and try to carry on. If it is GPT this will work.

    If it is formatted MBR you might get a message "Can't install windows on this disk". Normally you don't get this message if you delete all the partitions but you might.

    If you do you can press Shift+F10 to get a command box then enter:

    diskpart
    list disk
    select disk 0 (Changing the 0 for a different disk number if required).
    clean
    convert gpt
    exit

    And then carry on.
      My ComputerSystem Spec
  7.    10 Apr 2017 #17
    Join Date : Mar 2016
    Posts : 467
    Windows 10 Home

    Quote Originally Posted by dortmunder View Post
    change boot order to USB drive
    Yesterday I did not change the boot order.
    I just selected 'UEFI:PNY OU3 3.0' in the boot menu below.
    Click image for larger version. 

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      My ComputerSystem Spec
  8.    10 Apr 2017 #18

    Sergey Tkachenko at WinAero.com discloses a new built-in Windows utility in a WinAero.com article entitled Convert MBR To GPT With MBR2GPT In Windows 10 Version 1703 - Winaero. Check it out!
    --Ed--
      My ComputersSystem Spec
  9.    10 Apr 2017 #19
    Join Date : Mar 2016
    Posts : 467
    Windows 10 Home

    After I had converted MBR to GPT and installed Windows in UEFI mode, the following problem arose when it rebooted.
    Click image for larger version. 

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    Disconnecting other drives did not solve the problem, but selecting 'Windows Boot Manager' as the first boot device did.
      My ComputerSystem Spec
  10.    10 Apr 2017 #20
    Join Date : Oct 2014
    New Jersey
    Posts : 1,387
    Windows 7 Pro x64 Windows 10 Pro x64

    There is no reason to change the boot order in the Bios, everyone makes this mistake. Just use the Boot menu to choose the usb stick one time, that`s it.

    If you change the boot order in the bios it will just keep booting from the usb stick over and over.
      My ComputersSystem Spec

 
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