1.    15 Jul 2017 #1
    Join Date : Aug 2015
    Posts : 101
    windows 10 pro

    Win 10 pro MBR TO GPT


    I,m sorry if this has been posted before .

    I managed to secure erase my Samsung evo 850 m.2 250GB SSD then reinstalled windows using the official Microsoft tool . I don't know how but the disc is now MBR so wont allow me to use secure boot UEFI . I understand that the disc needs to be GPT to boot from UEFI settings . How do I convert the disc to GPT . I don't mind a reinstallation as I have a full back up of personal files .

    Thanks
      My ComputerSystem Spec
  2.    15 Jul 2017 #2
    Join Date : Jul 2014
    Serbia
    Posts : 10,454
    W10 Insider + Linux

    This is what I did when I changed from MB with legacy BIOS to one with UEFI. It didn't break anything but would be smart to make a full backup first.
    http://www.thewindowsclub.com/convert-mbr-to-gpt-disk
      My ComputersSystem Spec
  3.    15 Jul 2017 #3
    Join Date : Aug 2015
    Posts : 101
    windows 10 pro
    Thread Starter

    Had a look at your link and I,m sure the options would work for some . I decided to go back into my BIOS and found that I had the wrong settings . I had legacy enabled , UEFI and secure boot disabled so when the system found the USB boot disc it must have formatted the drive MBR . Changed back to UEFI and secure boot and made the first boot device USB . At set up I deleted the drive and re-created anew s imple volume and reformatted and the installation went ahead creating some system partitions and I had my GPT drive back .

    Thanks for your help
      My ComputerSystem Spec
  4.    15 Jul 2017 #4
    Join Date : Jul 2014
    Serbia
    Posts : 10,454
    W10 Insider + Linux

    Good thing you could afford to do it like that. I had invested to much time with setting up windows and programs so hade to do it in place.
      My ComputersSystem Spec

 

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