Accidentally nuked the EFI system partition, how can I repair it?


  1. Posts : 3
    Windows 10 dualbooted with Gentoo Linux
       #1

    Accidentally nuked the EFI system partition, how can I repair it?


    Currently, I'm (unsuccessfully) dual-booting Windows 10 with Gentoo Linux on my laptop.
    During my Gentoo install, I accidentally deleted all the files in my EFI system partition. How can I fix this? I really don't want to have to do a reinstall of Windows.

    If I do, I will then need to take it to my highscools IT to connect it back up to their network, which ussually takes them a couple days, AND last time I took something to them they deleted my Gentoo partition, which takes ages to install on my feeble laptop since it compiles the entire OS before installing. So I'd really like to avoid doing that at all costs.

    Is there a way to JUST fix boot issues in Windows's installer (and not totally reinstall Windows)? I don't mind if it overwrites all my Linux stuff in my EFI partition, I'll just back it up and fix things from a Linux livecd.

    Thanks for the help in advance :)

    Or even if the installer won't help me with this, I'm totally comfortable doing everything manually like placing files, making sure the Windows bootloader knows what partition to boot, etc. But I can't find much about doing any of that (nor can I find any of the files that would be required online).
      My ComputerSystem Spec

  2.    #2

    Hi and welcome to the forum

    I am not familiar with Gentoo (meaning I have never used it) but the link here has a ton of information that is worth looking through:
    UEFI Installing - Tips

    Good luck!
      My ComputerSystem Spec


  3. Posts : 3
    Windows 10 dualbooted with Gentoo Linux
    Thread Starter
       #3

    Rubi said: View Post
    Hi and welcome to the forum

    I am not familiar with Gentoo (meaning I have never used it) but the link here has a ton of information that is worth looking through:
    UEFI Installing - Tips

    Good luck!
    Thanks! Looking under "Windows 8/10 UEFI Repairs" it looks like it provides enough information so that I should be able to fix things. I don't know how I didn't find that when searching for info, so thanks :)
      My ComputerSystem Spec

  4.    #4

    If you are booting into Gentoo linux now, I would suggest looking in the Linux forums to find out how to add Windows to Grub (which is what I am assuming you are using to boot linux).
      My ComputerSystem Spec


  5. Posts : 3
    Windows 10 dualbooted with Gentoo Linux
    Thread Starter
       #5

    NavyLCDR said: View Post
    If you are booting into Gentoo linux now, I would suggest looking in the Linux forums to find out how to add Windows to Grub (which is what I am assuming you are using to boot linux).
    I'm actually using rEFInd (a different bootloader). But what I always thought happened was that GRUB when booting into Windows would ussually load Windows's bootloader, then THAT would boot into Windows (since GRUB dosn't have native support to boot into Windows its self). And all the files related to Windows in my EFI partition don't exists anymore, so I assume Windows's bootloader was one of those files, so GRUB won't be able to load it since it dosn't exist anymore.
      My ComputerSystem Spec

  6.    #6

    Sol33t303 said: View Post
    Thanks! Looking under "Windows 8/10 UEFI Repairs" it looks like it provides enough information so that I should be able to fix things. I don't know how I didn't find that when searching for info, so thanks :)
    You are more than welcome, hope everything turns out okay.
      My ComputerSystem Spec


 

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