Windows 10: Convert Windows 10 from Legacy BIOS to UEFI without Data Loss  

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  1. Posts : 25,246
    64-bit Windows 10 Pro build 17040
    Thread Starter
       21 Jul 2017 #60

    DaLee said: View Post
    Thanks for responding Brink. Looks as if this PC does not have uefi firmware settings only bios, came with windows 7 originally. Was finally able to figure how to boot from flash drive at a cold boot after changeing a few settings in bios and video taping the display to catch the text on the screen as it flew by.



    Is there a chance of a bios upgrade that may give the uefi option needed? Am looking now for newer version, wasnt any during the free W10 update. Currently has AMIBIOS Version 206



    Would a fresh install get me back to mbr ok?

    Odd. If your hardware didn't support UEFI, the conversion should have failed during the check to prevent it from being converted.
    Last edited by Brink; 21 Jul 2017 at 16:20.
      My ComputersSystem Spec

  2.    21 Jul 2017 #61

    It´s possible to “convert” the disk back to MBR. For example:


    1. Boot from a boot UFD with Macrium.
    2. Create a backup image of the disk in an external USB disk.
    3. With diskpart, clean the internal disk. This will convert it to MBR.
    4. Restore the Windows partition.
    5. Disconnect the external disk.
    6. Use “Fix Boot Problems” from the UFD to create the boot files in the Windows partition.
    7. Try a boot.
      My ComputerSystem Spec


  3. Posts : 5
    Windows
       21 Jul 2017 #62

    Brink said: View Post
    Odd. If you hardware didn't support UEFI, the conversion should have failed during the check to prevent it from being converted.
    It passed check, and after converting command prompt looked like yours did on the first page of this thread.

    BTW i edited my last post after you posted not seeing you had already posted.
      My ComputerSystem Spec


  4. Posts : 5
    Windows
       21 Jul 2017 #63

    Anibor said: View Post
    It´s possible to “convert” the disk back to MBR. For example:


    1. Boot from a boot UFD with Macrium.
    2. Create a backup image of the disk in an external USB disk.
    3. With diskpart, clean the internal disk. This will convert it to MBR.
    4. Restore the Windows partition.
    5. Disconnect the external disk.
    6. Use “Fix Boot Problems” from the UFD to create the boot files in the Windows partition.
    7. Try a boot.
    Thanks will keep this in mind, am still hoping to have gpt. Not sure if it was just in my head but this pc seemed noticably snapier before powering off.
      My ComputerSystem Spec


  5. Posts : 5
    Windows
       21 Jul 2017 #64

    Thanks for the help, decided to reinstall to mbr. I followed instructions here

    Convert GPT Disk to MBR Disk - Windows 7 Help Forums

    to convert back without incident. Will be doing extensive research before ever trying that again.
      My ComputerSystem Spec


  6. Posts : 25,246
    64-bit Windows 10 Pro build 17040
    Thread Starter
       21 Jul 2017 #65

    I'm glad you were able to get it sorted DaLee. Thank you for posting back with your results.

    Here are some more options for GPT to MBR to help others.

    Convert GPT Disk to MBR Disk in Windows 10 Windows 10 Hardware Drivers Tutorials
      My ComputersSystem Spec

  7.    22 Jul 2017 #66

    thnak you for your thread
      My ComputerSystem Spec

  8.    07 Oct 2017 #67

    hi about dual boot warning
    i have 3 ssd , with windows 10 , 8.1 and 7
    but in every operation system ,i have disabled the ssd in the device manager
    i mean for example in w10 ,device manager i have disabled the w8.1 and w7 ssd
    to boot in w10 or 7 i use the bios F8
    is my case a dual boot ? and the warning in the guide is refering me to avoid the procedure?
    and is there a way to convert my w8 and 7 in Uefi?
    thanks
      My ComputerSystem Spec


  9. Posts : 25,246
    64-bit Windows 10 Pro build 17040
    Thread Starter
       07 Oct 2017 #68

    Hello drugo,

    It's not recommended to use this in a mutiboot OS setup since it would most likely break being able to select an OS at boot. Of course, this also doesn't officially support Windows 7 or Windows 8.

    In your situation, you may need to start from scratch installing everything with UEFI to do so.
      My ComputersSystem Spec

  10.    07 Oct 2017 #69

    Brink said: View Post
    Hello drugo,

    It's not recommended to use this in a mutiboot OS setup since it would most likely break being able to select an OS at boot. Of course, this also doesn't officially support Windows 7 or Windows 8.

    In your situation, you may need to start from scratch installing everything with UEFI to do so.
    thank Sir Brink !
      My ComputerSystem Spec


 
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