How to do a clean install with a USB-stick booter

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  1. Posts : 7,484
    Windows 10 Home 20H2
       #11

    dortmunder said:
    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.

    NavyLCDR said:
    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 [email protected] disk bootable on uefi/gpt? - Solved - Windows 10 Forums
    You were one of those who answered my questions there. Thanks a lot!
      My Computer


  2. Posts : 17,361
    Windows 11 Pro
       #12

    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 Computer


  3. Posts : 68
    Windows 10 Enterprise 2015 LTSB x64
       #13

    dortmunder said:
    "...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 Computer


  4. Posts : 7,484
    Windows 10 Home 20H2
       #14

    NavyLCDR said:
    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.

    NavyLCDR said:
    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.

    anonjwm said:
    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 Computer


  5. Posts : 171
    Windows 10
    Thread Starter
       #15

    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 Computer


  6. Posts : 5,478
    2004
       #16

    Sounds good except for this bit...

    dortmunder said:
    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 Computer


  7. Posts : 7,484
    Windows 10 Home 20H2
       #17

    dortmunder said:
    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.
    How to do a clean install with a USB-stick booter-boot-menu.jpg
      My Computer


  8. Posts : 4,224
    Windows 10
       #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 Computers


  9. Posts : 7,484
    Windows 10 Home 20H2
       #19

    After I had converted MBR to GPT and installed Windows in UEFI mode, the following problem arose when it rebooted.
    How to do a clean install with a USB-stick booter-error.jpg
    Disconnecting other drives did not solve the problem, but selecting 'Windows Boot Manager' as the first boot device did.
      My Computer


  10. Posts : 4,594
    Windows 10 Pro
       #20

    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 Computers


 

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