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

Discus and support Convert Windows 10 from Legacy BIOS to UEFI without Data Loss in Windows 10 Tutorials to solve the problem; It´s possible to “convert” the disk back to MBR. For example: Boot from a boot UFD with Macrium. Create a backup image of the disk in an external... Discussion in 'Windows 10 Tutorials' started by simrick, Apr 10, 2017.

  1. Anibor Win User

    Convert Windows 10 from Legacy BIOS to UEFI without Data Loss


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


    • Boot from a boot UFD with Macrium.
    • Create a backup image of the disk in an external USB disk.
    • With diskpart, clean the internal disk. This will convert it to MBR.
    • Restore the Windows partition.
    • Disconnect the external disk.
    • Use “Fix Boot Problems” from the UFD to create the boot files in the Windows partition.
    • Try a boot.
     
    Anibor, Jul 21, 2017
    #61
  2. DaLee Win User

    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.
     
    DaLee, Jul 21, 2017
    #62
  3. DaLee Win User
    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.
     
    DaLee, Jul 21, 2017
    #63
  4. DaLee Win User

    Convert Windows 10 from Legacy BIOS to UEFI without Data Loss

    DaLee, Jul 21, 2017
    #64
  5. Brink
    Brink New Member
    Brink, Jul 21, 2017
    #65
  6. thnak you for your thread
     
    hichamaziz, Jul 22, 2017
    #66
  7. drugo Win User
    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
     
    drugo, Oct 6, 2017
    #67
  8. Brink
    Brink New Member

    Convert Windows 10 from Legacy BIOS to UEFI without Data Loss

    Hello drugo, *Smile

    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.
     
    Brink, Oct 6, 2017
    #68
  9. drugo Win User
    thank Sir Brink !
     
    drugo, Oct 6, 2017
    #69
  10. topgundcp Win User
    @simrick
    *Ditto This will align all partitions as if you do a fresh install. One exception that you do not need to completely clean install. Please look at step 4 of this post:
    UEFI Win Clean install using Macrium reflect - Page 2 - Windows 10 Forums
     
    topgundcp, Oct 21, 2017
    #70
  11. cereberus Win User
    cereberus, Oct 21, 2017
    #71
  12. simrick Win User
    simrick, Oct 21, 2017
    #72
  13. Brink
    Brink New Member

    Convert Windows 10 from Legacy BIOS to UEFI without Data Loss

    Here it is:

     
    Brink, Oct 21, 2017
    #73
  14. simrick Win User
    Thanks @Brink. Must be I don't have permission to view it then...
    And thanks @topgundcp - that's good to know!
     
    simrick, Oct 21, 2017
    #74
  15. Brink
    Brink New Member
    The thread was removed since the OP was banned for getting abusive in it.
     
    Brink, Oct 22, 2017
    #75
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Convert Windows 10 from Legacy BIOS to UEFI without Data Loss

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