Convert Windows 10 from Legacy BIOS to UEFI without Data Loss  

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  1. Posts : 1,324
    10 Pro retail 1909
       #130

    You have always been spot on and I appreciate our help. So much gets lost in writing rather than speaking.
    I did run system information and am in UEFI. That and checking GPT were the first two things I did when I got this.
    I agree I cannot enable secure boot in legacy mode that is why I am trying to find out how to disable legacy and enable secure boot. Once there I wanted to know how to gt back to legacy. Videos/readings I saw look nothing like this z 390 by Asus. so I cannot even guess at choices to get to enable secure boot. I knew you had to disable legacy then enable secure boot but these settings are not obvious.
    I bought Window 10 Pro and had him install it. I did not know it would be legacy.
    I asked him some questions but he is not rally helping me solve what I ask.
    I think I may ask if he would show me while I take notes even at a tutorial cost. I've run out of resources.

    PS I hope I can perform a clean install when I want - he maintains the PC is just like the old BIOS one while in legacy and UEFI.
    I can see removable media when I am in the firmware settings and in the boot settings.
      My Computer


  2. Posts : 17,246
    Windows 11 Pro
       #131

    To go to legacy boot mode would require you to re-partition your hard drive/ssd as MBR. That either requires software you have to pay for; or you can back up your current system, erase the hdd/ssd and make it MBR, then restore the backup files to it. In addition, you may have to recreate a system partition. It's not something a novice would want to tackle.

    The only reason to enable legacy boot mode on a UEFI system is to boot from an older operating system that cannot be set up to boot in UEFI mode. You don't seem to have that requirement.

    Maybe in your UEFI settings, legacy mode is called CSM. If you see options for CSM in your UEFI settings, disable that, and then you should be able to enable secure booting.

    The information you want is on page 2-23 & 3-24 of your motherboard user's manual (English language).
      My Computer


  3. Posts : 1,324
    10 Pro retail 1909
       #132

    It appears switching between legacy and non is not a viable idea.

    If I bought a new PC wouldn't it be UEFI without legacy and secure boot enabled?
    Maybe booting without legacy is difficult so he did me a favor by using legacy.
    I would think with my limited knowledge, I should have UEFI and secure boot with no legacy. Then he could show me how to boot from removable media, ex, disable secure boot, set up boot order with desired device at top.
    The alternative is to leave as is..
      My Computer


  4. Posts : 17,246
    Windows 11 Pro
       #133

    @maranna,
    Your computer is NOT booting in legacy (CSM) mode!!! Your computer is currently booting in UEFI mode. You could disable CSM right now in UEFI settings, enable secure boot, and you would not see any change in booting.
    Last edited by NavyLCDR; 21 Mar 2019 at 21:48.
      My Computer


  5. Posts : 1,324
    10 Pro retail 1909
       #134

    I understand thank you for all the help
      My Computer


  6. Posts : 10
    Windows 10
       #135

    Hello,
    I'm new to the forum. My brother purchased a new motherboard over a year ago, we just installed it last week.

    The BIOS was old and missing some menus, Windows installed in Legacy mode due to the missing setup menu selections. I used the above Option One and the conversion to UEFI was successful.

    However, a new drive "F" partition on the "C" drive was created and also shows up in "This PC" / Devices and Drives. Also, Disk 0 which was the "C" drive is now the "E" drive, which is a SSD data drive.

    I want to remove the "F" drive from This PC / Devices and Drives. Can I delete the "F" drive partition on the "C" drive?

    Two screen shots below:

    Convert Windows 10 from Legacy BIOS to UEFI without Data Loss-screenshot-1-.pngConvert Windows 10 from Legacy BIOS to UEFI without Data Loss-screenshot-2-.png

    Thanks
      My Computer


  7. Posts : 61,457
    64-bit Windows 11 Pro for Workstations
    Thread Starter
       #136

    Hello @mddi, and welcome to Ten Forums.

    The System Reserved partition is needed, so you don't want to delete it. However, you can safely remove its drive letter to no longer see it in This PC.

    What Is the System Reserved Partition and Can You Delete It?

    Remove Drive Letter in Windows 10
      My Computers


  8. Posts : 270
    Windows 10 Pro 21H2 (19044.1706)
       #137

    Want to do this later today but want to be sure I get it right (BTW, I have a Macrium image from yesterday if needed).

    This is my disk. Am I correct in stating that I would delete one of the recovery partitions before trying to change to UEFI ?

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

    Image hadn't attached. So good to delete a recovery partition then ?
    Last edited by OldGuyFromCdn; 15 Aug 2019 at 09:10.
      My Computer


  9. Posts : 61,457
    64-bit Windows 11 Pro for Workstations
    Thread Starter
       #138

    OldGuyFromCdn said:
    Want to do this later today but want to be sure I get it right (BTW, I have a Macrium image from yesterday if needed).

    This is my disk. Am I correct in stating that I would delete one of the recovery partitions before trying to change to UEFI ?

    Hello,

    Only needed if the disk has more than three partitions.
      My Computers


  10. Posts : 270
    Windows 10 Pro 21H2 (19044.1706)
       #139

    Okay, thanks Shawn. I'll try this tonight.
      My Computer


 

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