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; Here's the problem, though....average Joe user deletes the System Reserved Partition and then the conversion to GPT and UEFI booting fails for another... Discussion in 'Windows 10 Tutorials' started by simrick, Apr 10, 2017.

  1. cereberus Win User

    Convert Windows 10 from Legacy BIOS to UEFI without Data Loss


    1) user should make an image backup or backup valuable data as a minimum.

    2) you should always run validate option first.
     
    cereberus, Apr 13, 2017
    #31
  2. Brink
    Brink New Member

    Agreed.

    The conversion process will include validating before it actually converts though.
     
    Brink, Apr 13, 2017
    #32
  3. Anibor Win User
    I finally managed to do the conversion. Here is a summary:

    MBR disk: 4 partitions. SRP with WinRE, OS, extended with two logical data partitions.

    First try failed. Error: two partitions not recognized. The procedure found 6 partitions (not 4). The problem was related to the extended partition.

    I converted the 2 logicals to primaries. Now 4 primary partitions in the disk.

    Second try, also failed. Error: Too many MBR partitions.

    I deleted the last data partitions (a small one, easy to recover). Now 3 primary partitions in the disk.

    After this, the disk layout validated OK, the conversion was a success.

    GPT disk: Recovery, EFI, OS, data partition.

    The WinRe is enabled.
     
    Anibor, Apr 14, 2017
    #33
  4. agsbond Win User

    Convert Windows 10 from Legacy BIOS to UEFI without Data Loss

    Hi. I can't even validate using the mbr2gpt tool. I am getting an "Unrecognized partition found" error.

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


    The setuperr and setupact log files are attached too. Somebody please hep. *Smile

    Setuperr:
    Code: 2017-04-23 21:15:05, Error ValidateLayout: Unrecognized partition found, index 2 2017-04-23 21:15:05, Error Disk layout validation failed for disk 0[/quote] setupact:
    Code: 2017-04-23 21:15:05, Info MBR2GPT was explicitly asked to run in full OS mode.2017-04-23 21:15:05, Info MBR2GPT: System disk number is 0 2017-04-23 21:15:05, Info MBR2GPT: Attempting to validate disk 0 2017-04-23 21:15:05, Info MBR2GPT: Retrieving layout of disk 2017-04-23 21:15:05, Info MBR2GPT: Initial partition information 2017-04-23 21:15:05, Info =========================================================== 2017-04-23 21:15:05, Info Partition layout for disk: 0 2017-04-23 21:15:05, Info Partition style : MBR 2017-04-23 21:15:05, Info MBR signature: 1827330867 2017-04-23 21:15:05, Info Number of partitions : 4 2017-04-23 21:15:05, Info ===================PARTITION=============================== 2017-04-23 21:15:05, Info Number: 1 2017-04-23 21:15:05, Info Type: 7 2017-04-23 21:15:05, Info Boot: Yes 2017-04-23 21:15:05, Info Recognized: Yes 2017-04-23 21:15:05, Info Style: 0 2017-04-23 21:15:05, Info Offset: 1048576 2017-04-23 21:15:05, Info Length: 524288000 2017-04-23 21:15:05, Info Volume: \\?\Volume{6ceadb33-0000-0000-0000-100000000000}\ 2017-04-23 21:15:05, Info Drive: None 2017-04-23 21:15:05, Info NT Path: \Device\HardDisk0\Partition1 2017-04-23 21:15:05, Info ===================PARTITION=============================== 2017-04-23 21:15:05, Info Number: 2 2017-04-23 21:15:05, Info Type: 7 2017-04-23 21:15:05, Info Boot: No 2017-04-23 21:15:05, Info Recognized: Yes 2017-04-23 21:15:05, Info Style: 0 2017-04-23 21:15:05, Info Offset: 525336576 2017-04-23 21:15:05, Info Length: 107467505664 2017-04-23 21:15:05, Info Volume: \\?\Volume{6ceadb33-0000-0000-0000-501f00000000}\ 2017-04-23 21:15:05, Info Drive: C:\ 2017-04-23 21:15:05, Info NT Path: \Device\HardDisk0\Partition2 2017-04-23 21:15:05, Info ===================PARTITION=============================== 2017-04-23 21:15:05, Info Number: 0 2017-04-23 21:15:05, Info Type: 15 2017-04-23 21:15:05, Info Boot: No 2017-04-23 21:15:05, Info Recognized: No 2017-04-23 21:15:05, Info Style: 0 2017-04-23 21:15:05, Info Offset: 107993889792 2017-04-23 21:15:05, Info Length: 892209202176 2017-04-23 21:15:05, Info Volume: <unknown>, Error:0x00000012 2017-04-23 21:15:05, Info Drive: None 2017-04-23 21:15:05, Info NT Path: \Device\HardDisk0\Partition0 2017-04-23 21:15:05, Info ===================PARTITION=============================== 2017-04-23 21:15:05, Info Number: 3 2017-04-23 21:15:05, Info Type: 7 2017-04-23 21:15:05, Info Boot: No 2017-04-23 21:15:05, Info Recognized: Yes 2017-04-23 21:15:05, Info Style: 0 2017-04-23 21:15:05, Info Offset: 107993890816 2017-04-23 21:15:05, Info Length: 892209201152 2017-04-23 21:15:05, Info Volume: \\?\Volume{6ceadb33-0000-0000-0000-f02419000000}\ 2017-04-23 21:15:05, Info Drive: E:\ 2017-04-23 21:15:05, Info NT Path: \Device\HardDisk0\Partition3 2017-04-23 21:15:05, Info =========================================================== 2017-04-23 21:15:05, Info ESP partition size will be 104857600 2017-04-23 21:15:05, Info MBR2GPT: Validating layout, disk sector size is: 512 bytes 2017-04-23 21:15:05, Error ValidateLayout: Unrecognized partition found, index 2 2017-04-23 21:15:05, Error Disk layout validation failed for disk 0[/quote]
     
    agsbond, Apr 22, 2017
    #34
  5. Anibor Win User
    The process does not work with logical partitions. You can convert the logical to primary with MiniTool Partition Wizard Free.

    Or, you can delete the logical and restore it from a backup after the conversion.
     
    Anibor, Apr 22, 2017
    #35
  6. Convert Windows 10 from Legacy BIOS to UEFI without Data Loss [​IMG]
    hello bro i am new to fourm. can you please explain this command again for me

    reagentc /setreimage /path \\?\GLOBALROOT\device\harddisk0\partition3\Recovery\WindowsRE

    i have two partitions so i write partition 2 instead of 3 and come up with an error
    REAGENTC.EXE: The specified path was not found.
     
    gurgurdeep, May 5, 2017
    #36
  7. Convert Windows 10 from Legacy BIOS to UEFI without Data Loss [​IMG]
    Try this method but no success. And also usb media already contains install.wim file of about 3.5 gb.


    PS C:\WINDOWS\system32> REAGENTC /SetOSImage /Path C:\Win10-Recovery\INSTALL.WIM /Index 1Directory set to: \\?\GLOBALROOT\device\harddisk0\partition1\Win10-RecoveryREAGENTC.EXE: Operation Successful.PS C:\WINDOWS\system32> REAGENTC /InfoWindows Recovery Environment (Windows RE) and system reset configurationInformation: Windows RE status: Disabled Windows RE location: Boot Configuration Data (BCD) identifier: 42d7ea6a-31f3-11e7-a748-fa207b40608d Recovery image location: \\?\GLOBALROOT\device\harddisk0\partition1\Win10-Recovery Recovery image index: 1 Custom image location: Custom image index: 0REAGENTC.EXE: Operation Successful.PS C:\WINDOWS\system32> mbr2gpt /convert /allowfullOSMBR2GPT will now attempt to convert the default book disk.If conversion is successful the disk can only be booted in GPT mode.These changes cannot be undone!MBR2GPT: Attempting to convert disk 0MBR2GPT: Retrieving layout of diskMBR2GPT: Validating layout, disk sector size is: 512 bytesCannot find OS partition(s) for disk 0PS C:\WINDOWS\system32>
     
    gurgurdeep, May 5, 2017
    #37
  8. Convert Windows 10 from Legacy BIOS to UEFI without Data Loss

    Sir i manage to boot to uefi using this command. But during conversion there is one command missing please see image. So i want to know that is the conversion is sucessfully placed or not?
    Convert Windows 10 from Legacy BIOS to UEFI without Data Loss [​IMG]
     
    gurgurdeep, May 5, 2017
    #38
  9. Brink
    Brink New Member
    Hello @gurgurdeep, *Smile

    I don't see anything missing in your screenshot. It looks like it has successfully converted to UEFI.

    You will need to boot to your UEFI firmware settings, and switch the firmware to boot to UEFI mode instead of Legacy BIOS (CSM) to finish.
     
    Brink, May 5, 2017
    #39
  10. Ya already done that. Thanks for procedure.
     
    gurgurdeep, May 5, 2017
    #40
  11. tfwul Win User
    Just to make sure:
    Motherboard: X99

    Currently: Windows 10 x64 15063.296
    Legacy BIOS.

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


    2 SSD's and multiple HDD's

    1st SSD is Disk 1 = Windows
    2nd SSD is Disk 2

    rest are HDD's
    Disk 0 is also MBR
    Disk 7 is an encrypted container


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


    Questions:
    - should I convert all 3 MBR disks?
    - in case I convert disk 2, (containing Windows) how will it then handle the reserved unallocated SSD space ?
    Assume it will remain untouched.
    - on disk 3 (SSD) obviously there is also a reserved space
    - should I run two separate commands

    a) MBR2GPT /validate /disk:2 /logs:d:\
    and then
    b) MBR2GPT convert /disk:2 /logs:d:\ /allowFullOS

    or
    MBR2GPT convert /disk:2 /logs:d:\ /allowFullOS /validate

    Thanks!
    =
     
    tfwul, May 21, 2017
    #41
  12. Brink
    Brink New Member
    Hello @tfwul, *Smile

    You can run the command below in an elevated command prompt while in Windows to validate and see if it will be able to convert your Windows installation to UEFI or not.

    mbr2gpt /validate /allowFullOS

    If it says it's able to, then you can run the command below to convert.

    mbr2gpt /convert /allowfullOS
     
    Brink, May 21, 2017
    #42
  13. tfwul Win User

    Convert Windows 10 from Legacy BIOS to UEFI without Data Loss

    Thanks again. BTW, as always, the very last thing before applying upgrades is creating a image (Macrium), so I can always revert to a working Windows. I wonder, images created in the legacy BIOS/MBR mode, would it be possible to restore them after conversion.
    Really wouldn't know.

    Assume media creation tool will not be able create a UEFI USB thumbdrive?
    (I need Rufus for that?)
    or will mediacreation tool 'see/recognize' an UEFI system and then thus create an UEFI USB thumbdrive.


    =
     
    tfwul, May 21, 2017
    #43
  14. Brink
    Brink New Member
    Brink, May 21, 2017
    #44
  15. tfwul Win User
    I will do this conversion once I know .. if.., and if so, where and what exactly I also need to change in the BIOS of my Asus x99 DeLuxe/U3.1
    It seems I should go into the BIOS settings as well and should change 'something, somewhere in some screen'. Have spent quite a bit of time trying to figure this out.

    I'll continue searching.

    =
     
    tfwul, May 22, 2017
    #45
Thema:

Convert Windows 10 from Legacy BIOS to UEFI without Data Loss

Loading...
  1. Convert Windows 10 from Legacy BIOS to UEFI without Data Loss - Similar Threads - Convert Legacy BIOS

  2. Changing from Legacy Bios to UEFI, settings in bios and Windows 10

    in Windows 10 Installation and Upgrade
    Changing from Legacy Bios to UEFI, settings in bios and Windows 10: I used the Windows converting program MBR2GPT.exe to convert my SSD to GPT and it reported it had done it. I then rebooted and entered the bios and changed one setting from Legacy ROM to EFI Compatible ROM and another setting called 'UEFI Boot' from Disabled to Enabled and...
  3. Convert legacy bios to uefi on old fashioned install

    in Windows 10 Installation and Upgrade
    Convert legacy bios to uefi on old fashioned install: I know to convert legacy bios to uefi using mbr2gpt IF the legacy bios has a separate system partition but it does not work for old fashioned legacy bios installs where there is not a separate partition. I also know how to do it the older way with Macrium Reflect i.e. image...
  4. Convert legacy bios to uefi on old fashioned install

    in Windows 10 Support
    Convert legacy bios to uefi on old fashioned install: I know to convert legacy bios to uefi using mbr2gpt IF the legacy bios has a separate system partition but it does not work for old fashioned legacy bios installs where there is not a separate partition. I also know how to do it the older way with Macrium Reflect i.e. image...
  5. Bitlocker with Windows 10 and EFI/UEFI Bios and Legacy Bios + MBR or GPT disk

    in AntiVirus, Firewalls and System Security
    Bitlocker with Windows 10 and EFI/UEFI Bios and Legacy Bios + MBR or GPT disk: Hello, I've read alot online about all of the scenarios for bitlocker and using Windows 10 with TPM 2.0. I've read things that said bitlocker encryption is not possible if it's a Win 10 box with TPM 2.0 bios in Legacy mode. It must be UEFI/EFI to work. Is this correct?...
  6. UEFI or Legacy?

    in Windows 10 Installation and Upgrade
    UEFI or Legacy?: So i went for a clean Windows 10 installation on my Aspire E13. To boot from USB i had to switch from UEFI to Legacy, otherwise the USB drive would not be listed. However. After the installation was finished my touchpad was not even recognized, i mean, i was not even...
  7. EFI, UEFI, Legacy BIOS.......

    in Windows 10 Installation and Upgrade
    EFI, UEFI, Legacy BIOS.......: This weekend I will try to do a clean install of Win 10 again, from Win 7. Have to try som new methods to see if I can get my computer running flawlessly with Windows 10. I will use the clean install tutorials from this forum. I hav two options, with or without UEFI...
  8. Converting an mbr install to UEFI without loss of data.

    in Windows 10 Installation and Upgrade
    Converting an mbr install to UEFI without loss of data.: Just seen a well presented video that shows how to convert an mbr based installation of windows to a UEFI based install without reinstalling OS and losing data. Convert Windows 7/8/10 Installation from Legacy to UEFI Without Data Loss (Simpler Method) - YouTube...
  9. Check if Windows 10 is using UEFI or Legacy BIOS

    in Windows 10 Tutorials
    Check if Windows 10 is using UEFI or Legacy BIOS: Great tutorial - I would have stopped at option 1 as it does the job perfectly but hey I am just a lazy engineer who loves great solutions with minimal effort *chuckle. 85195
  10. Intel Removing Legacy BIOS Support from Motherboard UEFI in 2020

    in Windows 10 News
    Intel Removing Legacy BIOS Support from Motherboard UEFI in 2020: Intel is working on a plan to remove so-called "last-mile" barriers to killing off legacy BIOS by requiring UEFI Class 3, which doesn't expose legacy BIOS interfaces. BIOS is the firmware that helped older PCs boot up after powering on and offered a runtime for the...