Convert Windows 10 from Legacy BIOS to UEFI without Data Loss  

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  1. Posts : 5
    Windows 10 on desktop, Windows 10 on laptop
       #150

    NavyLCDR said:
    Look for an option to enable/disable CSM mode. Why is there a need to change it, though?
    The computer is running fine, but my understanding is that with UEFI fully enabled, it would be more secure and have faster startup and shutdown, and probably some other benefits that I'm not aware of.
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  2. NavyLCDR's Avatar
    Posts : 13,209
    Windows 10 Pro
       #151

    Seeker said:
    The computer is running fine, but my understanding is that with UEFI fully enabled, it would be more secure and have faster startup and shutdown, and probably some other benefits that I'm not aware of.
    Not really. Only more secure at boot time, if secure boot is enabled. The other benefits are the ability to utilize all the space on a drive >2TB in size and have more than 4 primary partitions. Does the computer have a drive >2TB and does the owner need more than 4 primary partitions on the drive?
    Last edited by NavyLCDR; 09 Mar 2020 at 22:21.
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  3. Posts : 5
    Windows 10 on desktop, Windows 10 on laptop
       #152

    NavyLCDR said:
    Not really. Only more secure at boot time, if secure boot is enabled. The other benefits are the ability to utilize all the space on a drive >2TB in size and have more than 4 primary partitions. Does the computer have a drive >2TB and does the owner need more than 4 primary partitions on the drive?
    It only has one drive which is nowhere near 2TB, and doesn't need extra partitions. I do enjoy fixing and upgrading computers, and I was intrigued by how easy the transition to GPT/UEFI would be using MBR2GPT. But with your advice, I'll just leave well-enough alone! One less thing for me to do.
    Thanks, Navy!
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  4. Posts : 36
    Windows10 1909 x64 Home
       #153

    Hi Shawn, friend of mine who I am helping with windows, recently got an Acer Aspire 6 a615-51-51v1 with UEFI and restored W10 to legacy BIOS because she used an old emergency USB from a friend. Then she downloaded a fresh install of W10 x64 Home Single Language following the 10 Forums tutorials I sent her and used a new FAT32 USB to install that, said she changed BIOS to UEFI before booting but ended up legacy again (see picture)
    Convert Windows 10 from Legacy BIOS to UEFI without Data Loss-k93usuhkyvul.jpg
    I advised to do it all over again, should she run diskpart first to convert MBR to GPT disk? Or will the W10 install process overwrite the legacy MBR partition? Is it possible that her mbo/HDD is not UEFI compatible (1 year old model, hard to believe)?
    Thanks
    Frank
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  5. NavyLCDR's Avatar
    Posts : 13,209
    Windows 10 Pro
       #154

    FrankW said:
    Hi Shawn, friend of mine who I am helping with windows, recently got an Acer Aspire 6 a615-51-51v1 with UEFI and restored W10 to legacy BIOS because she used an old emergency USB from a friend. Then she downloaded a fresh install of W10 x64 Home Single Language following the 10 Forums tutorials I sent her and used a new FAT32 USB to install that, said she changed BIOS to UEFI before booting but ended up legacy again (see picture)
    Convert Windows 10 from Legacy BIOS to UEFI without Data Loss-k93usuhkyvul.jpg
    I advised to do it all over again, should she run diskpart first to convert MBR to GPT disk? Or will the W10 install process overwrite the legacy MBR partition? Is it possible that her mbo/HDD is not UEFI compatible (1 year old model, hard to believe)?
    Thanks
    Frank
    The screenshot that you have posed shows a UEFI installation. Look at the second partition on disk 0, what does it say it is? It says EFI System. You don't get an EFI System partition on a legacy BIOS install.
      My Computer


  6. Posts : 36
    Windows10 1909 x64 Home
       #155

    Thanks NavyLCDR, the picture looked so different from my EFI partitions so I assumed it was legacy, completely overlooked UEFI
    Frank
      My Computer


 

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