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; The thread was removed since the OP was banned for getting abusive in it. *Eek Oki doki. Discussion in 'Windows 10 Tutorials' started by simrick, Apr 10, 2017.

  1. simrick Win User

    Convert Windows 10 from Legacy BIOS to UEFI without Data Loss


    *Eek Oki doki.
     
    simrick, Oct 22, 2017
    #76
  2. billteeth Win User

    Hoping for some help figuring out my issue.
    MBR2GPT is not able to validate my disk.
    The error says:
    Cannot map MBR partition type 238. Please supply custom mapping through the command line.
    First partition too close to the beginning of the disk. Should start at offset 17408 or above, found at 512


    Convert Windows 10 from Legacy BIOS to UEFI without Data Loss [​IMG]

    Convert Windows 10 from Legacy BIOS to UEFI without Data Loss [​IMG]

    Convert Windows 10 from Legacy BIOS to UEFI without Data Loss [​IMG]


    Any thoughts?
     
    billteeth, Oct 24, 2017
    #77
  3. NavyLCDR New Member
    It's probably the GPT Protective Partition, but it is really weird that it is only a small part of the drive:
    How to Access GPT Protective Partition Without Losing Data Windows 10/8/7 - EaseUS

    Be advised, a lot of articles say to use the diskpart "clean" command. That command erases the ENTIRE drive - ALL PARTITIONS. If you don't have a backup of what you want to keep, it will get erased using the CLEAN command.
     
    NavyLCDR, Oct 24, 2017
    #78
  4. Burgurne Win User

    Convert Windows 10 from Legacy BIOS to UEFI without Data Loss

    Worked just fine here. Thank you
     
    Burgurne, Nov 30, 2017
    #79
  5. Brink
    Brink New Member
    I'm glad it could help Burgurne. *Smile
     
    Brink, Nov 30, 2017
    #80
  6. dowon Win User
    Hello, I was successfully able to convert to UEFI using this tutorial. I checked my partitions and noticed that a new partition (EFI System Partition) was added. Is it safe to delete this to get more memory or should I leave it as is?


    Convert Windows 10 from Legacy BIOS to UEFI without Data Loss [​IMG]
     
    dowon, Jan 2, 2018
    #81
  7. Brink
    Brink New Member
    Hello dowon, *Smile

    The EFI partition is normal. You do not want to delete it since it is required to boot a UEFI Windows installation.

    I'm glad it went smoothly for you.
     
    Brink, Jan 2, 2018
    #82
  8. NavyLCDR New Member

    Convert Windows 10 from Legacy BIOS to UEFI without Data Loss

    The EFI System Partition is now what the computer is booting from. Delete it and the computer will not boot.
     
    NavyLCDR, Jan 2, 2018
    #83
  9. Kpat62 Win User
    Ok the conversion went well. Although it messed up System restore, there was a C drive (missing) in the available drives which had to be deleted.
    Also it has assigned a drive letter E to the System reserved partition when it did not have one before.

    Convert Windows 10 from Legacy BIOS to UEFI without Data Loss [​IMG]


    Should the drive letter be removed?
     
    Kpat62, Jan 31, 2018
    #84
  10. Brink
    Brink New Member
    Hello Kpat62, *Smile

    Yes, you can remove the drive letter for "E". It normally wouldn't have one.
     
    Brink, Jan 31, 2018
    #85
  11. Kpat62 Win User
    Thank you Brink
    I set the label to none. All is well.
     
    Kpat62, Jan 31, 2018
    #86
  12. Brink
    Brink New Member
    Not that I'm aware of. *Sad

    You might create a separate thread in the Installation & Upgrade forum area to see if someone may know an easier way.
     
    Brink, Apr 4, 2018
    #87
  13. ntd252 Win User

    Convert Windows 10 from Legacy BIOS to UEFI without Data Loss

    I have a triple-boot system: Windows 7 + Windows 10 + Linux Mint.
    I have backed up everything, so can I use that method with accepting that things can go wrong?
     
    ntd252, Apr 18, 2018
    #88
  14. Brink
    Brink New Member
    Hello ntd252,

    I wouldn't recommend doing this when you have a multiboot system like that. It will most likely break it. *Sad
     
    Brink, Apr 18, 2018
    #89
  15. ntd252 Win User
    Is there any way to do it quicly?
    In the past, I installed Windows 7 first with a 100MB System Reserved, then Windows 10 and last Linux Mint.
    Linux uses Grub2, while Windows7/10 use Windows boot manager.
    I will be sad if I have to copy everything from current disk, convert it and then get data back. *Sad
     
    ntd252, Apr 18, 2018
    #90
Thema:

Convert Windows 10 from Legacy BIOS to UEFI without Data Loss

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