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; That's a good one Shawn. *Thumbs 81502 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


    That's a good one Shawn. *Thumbs

    :)
     
    simrick, Apr 10, 2017
    #1

  2. Unsupported disk layout for UEFI firmware

    Yes. Windows now includes a utility to convert your MBR disk to GPT (which is what UEFI requires) without data loss.



    MBR2GPT.EXE is part of Windows 10 version 1703, which came out in Spring 2017. What version of Windows are you running now? It sounds like you are currently running in Legacy BIOS mode on a PC that is capable of UEFI BIOS mode.

    MBR2GPT
     
    Don Cuthbert, Apr 10, 2017
    #2
  3. Unsupported disk layout for UEFI firmware

    I will let him tell us the details, but it sounds to me like he is running setup.exe to upgrade Windows 10 from within running Windows. If he was running Legacy BIOS mode, he could not boot UEFI media and if he has switched to UEFI BIOS mode, his existing
    Windows 10 would not boot. If he is booting Windows install media and wants to upgrade, setup will say to run it from within Windows instead. I think that sometimes Windows setup detects a UEFI-capable PC, running in Legacy BIOS mode, and tries to force
    a switch to UEFI mode.

    In any event, he can run MBR2GPT to convert the drive without formatting or losing data. If he does not yet have version 1703 or greater of Windows 10, he can probably still boot with version 1709 install media and convert the disk to GPT using MBR2GPT.EXE.

    Even prior to the release of MBR2GPT, there were ways to convert back and forth, such as by booting a Ubuntu Live USB and running Gparted. I once made the mistake of converting my old Dell Legacy BIOS laptop hard drive to GPT and had to switch it back before
    I could boot Windows again. Gparted worked to fix that without losing anything.
     
    Don Cuthbert, Apr 10, 2017
    #3
  4. gdc88 Win User

    Convert Windows 10 from Legacy BIOS to UEFI without Data Loss

    hello, i'm getting this:

    Microsoft Windows [Version 10.0.15063]
    (c) 2017 Microsoft Corporation. All rights reserved.
    C:\WINDOWS\system32>MBR2GPT /validate /allowFullOS
    MBR2GPT: Attempting to validate disk 0
    MBR2GPT: Retrieving layout of disk
    MBR2GPT: Validating layout, disk sector size is: 512 bytes
    Cannot find OS partition(s) for disk 0
    please help
     
    gdc88, Apr 11, 2017
    #4
  5. Brink
    Brink New Member
    Brink, Apr 11, 2017
    #5
  6. gdc88 Win User
    gdc88, Apr 11, 2017
    #6
  7. Brink
    Brink New Member
    Brink, Apr 11, 2017
    #7
  8. gdc88 Win User

    Convert Windows 10 from Legacy BIOS to UEFI without Data Loss

    Startup Repair diagnosis and repair log---------------------------Last successful boot time: ‎4/‎12/‎2017 3:22:16 PM (GMT)Number of repair attempts: 2Session details---------------------------System Disk = \Device\Harddisk0Windows directory = H:\WINDOWSAutoChk Run = 0Number of root causes = 1Test Performed: ---------------------------Name: Check for updatesResult: Completed successfully. Error code = 0x0Time taken = 0 msTest Performed: ---------------------------Name: System disk testResult: Completed successfully. Error code = 0x0Time taken = 0 msTest Performed: ---------------------------Name: Disk failure diagnosisResult: Completed successfully. Error code = 0x0Time taken = 16 msTest Performed: ---------------------------Name: Disk metadata testResult: Completed successfully. Error code = 0x0Time taken = 0 msTest Performed: ---------------------------Name: Target OS testResult: Completed successfully. Error code = 0x0Time taken = 297 msTest Performed: ---------------------------Name: Volume content checkResult: Completed successfully. Error code = 0x0Time taken = 0 msTest Performed: ---------------------------Name: Boot manager diagnosisResult: Completed successfully. Error code = 0x0Time taken = 0 msTest Performed: ---------------------------Name: System boot log diagnosisResult: Completed successfully. Error code = 0x0Time taken = 0 msTest Performed: ---------------------------Name: Event log diagnosisResult: Completed successfully. Error code = 0x0Time taken = 16 msTest Performed: ---------------------------Name: Internal state checkResult: Completed successfully. Error code = 0x0Time taken = 0 msTest Performed: ---------------------------Name: Check for pending package installResult: Completed successfully. Error code = 0x0Time taken = 1281 msTest Performed: ---------------------------Name: Boot status testResult: Completed successfully. Error code = 0x0Time taken = 0 msRoot cause found: ---------------------------Boot status indicates that the OS booted successfully.------------------------------------------------------Session details---------------------------System Disk = \Device\Harddisk0Windows directory = H:\WINDOWSAutoChk Run = 0Number of root causes = 1Test Performed: ---------------------------Name: Check for updatesResult: Completed successfully. Error code = 0x0Time taken = 0 msTest Performed: ---------------------------Name: System disk testResult: Completed successfully. Error code = 0x0Time taken = 0 msTest Performed: ---------------------------Name: Disk failure diagnosisResult: Completed successfully. Error code = 0x0Time taken = 0 msTest Performed: ---------------------------Name: Disk metadata testResult: Completed successfully. Error code = 0x0Time taken = 0 msTest Performed: ---------------------------Name: Target OS testResult: Completed successfully. Error code = 0x0Time taken = 281 msTest Performed: ---------------------------Name: Volume content checkResult: Completed successfully. Error code = 0x0Time taken = 250 msTest Performed: ---------------------------Name: Boot manager diagnosisResult: Completed successfully. Error code = 0x0Time taken = 0 msTest Performed: ---------------------------Name: System boot log diagnosisResult: Completed successfully. Error code = 0x0Time taken = 0 msTest Performed: ---------------------------Name: Event log diagnosisResult: Completed successfully. Error code = 0x0Time taken = 16 msTest Performed: ---------------------------Name: Internal state checkResult: Completed successfully. Error code = 0x0Time taken = 0 msTest Performed: ---------------------------Name: Check for pending package installResult: Completed successfully. Error code = 0x0Time taken = 1484 msTest Performed: ---------------------------Name: Boot status testResult: Completed successfully. Error code = 0x0Time taken = 0 msRoot cause found: ---------------------------Boot status indicates that the OS booted successfully.------------------------------------------------------
     
    gdc88, Apr 11, 2017
    #8
  9. gdc88 Win User
    in addition, i had to start the diagnostic through usb - in my troubleshot doesn't appear "Startup Repair"

    thank you
     
    gdc88, Apr 11, 2017
    #9
  10. Brink
    Brink New Member
    It looks like the issue is that you not have a working recovery partition. That would also be why "Startup Repair" wasn't available unless you booted from the Windows 10 installation USB.
     
    Brink, Apr 11, 2017
    #10
  11. gdc88 Win User
    is there any way to recover it?

    * already tried backup restore from my laptop - but it didn't work
     
    gdc88, Apr 11, 2017
    #11
  12. Brink
    Brink New Member
    Short of doing a clean install, I'm not sure. *Sad
     
    Brink, Apr 11, 2017
    #12
  13. simrick Win User

    Convert Windows 10 from Legacy BIOS to UEFI without Data Loss

    There might be a way:
    Do a Macrium image of your C partition (verified).
    Clean install Windows.
    Boot to Macrium and copy the image of C back over the clean install C partition.
    That will get your partitions back to where they need to be.

    What do you think Brink?
     
    simrick, Apr 11, 2017
    #13
  14. gdc88 Win User
    tried with acronis - backup ed the recovery partition and restored

    took it from my fujitsu lifebook - everything work on it

    on my pc not*Sad
     
    gdc88, Apr 11, 2017
    #14
  15. Brink
    Brink New Member
    Brink, Apr 11, 2017
    #15
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Convert Windows 10 from Legacy BIOS to UEFI without Data Loss

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