Convert Windows 10 from Legacy BIOS to UEFI without Data Loss  

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  1. Posts : 417
    Windows 10 1803
       #140

    Apologies for double posting this minor annoyance but did not see this thread, which is more spot-on.
    I ran MBR2GPT to convert a new installation from mbr [after using windows media via usb to install everything]
    It all succeeded except for "failed to update Reagent.xml"
    Reagentc is status: Disabled and I cannot change that [elevated prompt].
    Not seeing clearly what the original problem is, what the goal is. Should I delete the xml file and recreate? Or is there some dependency that is blocking access?
    I'm sorta stuck here... guessing that if I shut down I'm going to end up with a reinstall task

    See thread here: Reagentc failed

    thx
    c
      My Computer


  2. Posts : 1,324
    10 Pro retail 1909
       #141

    This too hard for me and hope a mod will address your plight. I too would like to be able to perform such a task but would want to know what happened to you first.
      My Computer


  3. Posts : 16
    Windows 10
       #142

    Perfect!!


    I used the first option and solved the problem my laptop had, which only started in Legacy mode. Now come back to the normal boot EUFI mode, thank you so much !!
      My Computer


  4. Posts : 61,473
    64-bit Windows 11 Pro for Workstations
    Thread Starter
       #143

    flino89 said:
    I used the first option and solved the problem my laptop had, which only started in Legacy mode. Now come back to the normal boot EUFI mode, thank you so much !!

    Welcome to Ten Forums flino89.
      My Computers


  5. Posts : 6
    Win 10
       #144

    Hello everyone, this is my first post. First of all, thanks for the tutorial, it looks very complete and simple.

    I am trying to convert using Option 1 (mbr2gpt / convert / allowfullOS), and I get the following error:

    Convert Windows 10 from Legacy BIOS to UEFI without Data Loss-1.jpg

    My pc has two disks, an SSD (where W10 is installed), and an HDD (data only). Here I leave the Disk Mg info (it is in Spanish, but you can easily deduce everything I guess).

    Convert Windows 10 from Legacy BIOS to UEFI without Data Loss-2.jpg

    Any suggestions?
    Thank you!
      My Computer


  6. Posts : 61,473
    64-bit Windows 11 Pro for Workstations
    Thread Starter
       #145

    Hello @smrdelj, and welcome to Ten Forums.

    I noticed that your Disk 1 you are trying to convert has 5 partitions on it, and 1 being unallocated.

    You can't have more than three partitions on this Disk 1 because there's a limit of four for this conversion and one is needed to create the new UEFI system partition.

    It's easy enough to extend the 450 MB partition into the unallocated partition to remove the unallocated partition, but you would still need to remove the 450 MB partition afterwards to only have 3 by extending the 460 MB partition into the unallocated 450 MB to remove it.
      My Computers


  7. Posts : 92
    Win10 Pro
       #146

    If I have to run MBR2GPT from WINPE, is there any specific requirement bout booting the PE in Legacy Or UEFI mode?
      My Computers


  8. Posts : 61,473
    64-bit Windows 11 Pro for Workstations
    Thread Starter
       #147

    inwell said:
    If I have to run MBR2GPT from WINPE, is there any specific requirement bout booting the PE in Legacy Or UEFI mode?
    Hello,

    You would only need to switch your UEFI settings from UEFI to Legacy BIOS (CSM) after converting with MBR2GPT in a command prompt at boot.

    It doesn't matter how you open the command prompt at boot.
      My Computers


  9. Posts : 6
    Windows 10 on desktop, Windows 10 on laptop
       #148

    How to tell if a computer is UEFI capable?


    A friend I do tech support for has an obscure model of laptop that was only marketed for a couple years in the early 2010's: it's a Vizio CT15-A1 15 Thin & Light. It was upgraded to Windows 10, but according to System Info, Windows 10 was installed in Legacy BIOS mode. If it has a UEFI BIOS, I would like to convert the system drive from MBR to GPT. I suspect this computer actually has a UEFI BIOS, but how do I find out for sure? I've looked through the BIOS setup, but I didn't see "Secure Boot" anywhere.
    Last edited by Seeker; 09 Mar 2020 at 19:32.
      My Computer


  10. Posts : 17,246
    Windows 11 Pro
       #149

    Seeker said:
    A friend I do tech support for has an obscure model of laptop that was only marketed for a couple years in the early 2010's: it's a Vizio CT15-A1 15 Thin & Light. It is running Windows 10, but according to System Info, Windows 10 was installed in Legacy BIOS mode. If it has a UEFI BIOS, I would like to convert the system drive from MBR to GPT. I suspect this computer actually has a UEFI BIOS, but how do I find out for sure? I've looked through the BIOS setup, but I didn't see "Secure Boot" anywhere.
    Look for an option to enable/disable CSM mode. Why is there a need to change it, though?
      My Computer


 

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