Windows 8 and 8.1 Forums


Windows 8.1 MBR Install, Wish to convert to GPT

  1. #1


    Sidmouth
    Posts : 2
    Windows 8.1 Pro

    Windows 8.1 MBR Install, Wish to convert to GPT


    Hello!

    This is my first post!

    I have Windows 8.1 Pro, Custom PC. Setup but didn't change to UEFI setting under BIOS.
    I have been trying to change my system disk to GPT, Using various LiveCD's but I keep ending up with a MBR drive.

    Anyone got a way of converting my disk to GPT without a reinstall?

    Thanks

      My System SpecsSystem Spec

  2. #2


    Yes you'll have to reinstall window in UEFI mode. There is no conversion of MBR OS to UEFI GPT Here are some step by Step tutorials on how to do this https://www.eightforums.com/gtsearch....o+install+UEFI
      My System SpecsSystem Spec

  3. #3


    Sidmouth
    Posts : 2
    Windows 8.1 Pro


    Ok so what's the best way to get the OS the same. Took ages to get it set up
      My System SpecsSystem Spec

  4. #4


    Clean install is the only way. Clean Install - Windows 8 Insure that you create you USB Install media and boot it in UEFI mode.
      My System SpecsSystem Spec

  5. #5


    Posts : 5,360
    7/8/ubuntu/Linux Deepin


    It is possible with gdisk, but not easy.

    Another way may be to try one of the imaging programs which can restore an image to gpt disk.

    I believe aomei can , make the image of your current install partition and then use aomei linux boot disc to restore to gpt disk. I think paragon can do it also.

    How to Convert GPT to MBR or Convert MBR to GPT without Losing Data?
      My System SpecsSystem Spec

  6. #6


    Be sure to back up your data before trying this.
      My System SpecsSystem Spec

  7. #7


    Posts : 2,690
    Windows 3.1 > Windows 10


    First off - what are your BIOS setting ?
    You have to enable UEFI and disable Legacy/CSM

    Another way to force a UEFI booting is to rename BOOTMGR on the setup media to BOOTMGR.old

    Now that you have the OS the way you want it - use Macrium or Acronis or Aomie Backupper to make a backup Image of your current C partition

    Reinstall windows 8.1 using the setup media (with bootmgr renamed) and let it setup your Partitions, after you create a user name.

    restore the backup image of drive C you created to the New C partition
      My System SpecsSystem Spec

  8. #8


    Posts : 50
    win8 64bit


    I agree with SIW2. after converting to GPT, you can go to bios to change to uefi boot mode.
    Quote Originally Posted by SIW2 View Post
    It is possible with gdisk, but not easy.

    Another way may be to try one of the imaging programs which can restore an image to gpt disk.

    I believe aomei can , make the image of your current install partition and then use aomei linux boot disc to restore to gpt disk. I think paragon can do it also.

    How to Convert GPT to MBR or Convert MBR to GPT without Losing Data?
      My System SpecsSystem Spec

  9. #9


    Posts : 2,690
    Windows 3.1 > Windows 10


    when you convert to GPT - you will need to create two partitions a FAT32 efi partition and a MSR partition - and then run bcdboot to restore the boot files.. There is more to converting a MBR disk to GPT then just clicking convert...

    If it was that easy - diskpart - select disk 0 - convert GPT

    BUT IT IS NOT THAT EASY..
      My System SpecsSystem Spec

Windows 8.1 MBR Install, Wish to convert to GPT
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