Windows 8 and 8.1 Forums

Raw filesystem on EFI partition, Windows 8.1 can't boot

  1. #11

    Posts : 5
    Windows 8.1

    Thank you for your answer KYHI, the solution you propose looks very neat.

    However, I can not really try it as I already formatted all my disk and reinstalled from scratch, which worked very well. Your solution would have saved me from reinstalling all my software, but I am now happy to be sure that all my disk partitions are ok, not just the efi one.

    Also, at the time, I did not feel very safe to reformat the efi partition alone, as I thought it would break by Ubuntu boot. I now realize that simply using a linux boot-repair usbkey just after your solution would have most likely solved all my problems.

      My System SpecsSystem Spec

  2. #12

    That's a shame... the efi partition is easy to fix, hardly worth formatting the entire disk...
      My System SpecsSystem Spec

  3. #13

    Posts : 1
    Windows 8.1, Xubuntu Linux

    In case somebody finds this post in the future (like I just did): I was in the same situation as rejelepindre and managed to make it work with hydranix's instructions, with a couple of small changes:

    1. Back up the contents of the EFI partition (on Linux)

    2. I had to delete the old partition before creating a new one:

    list disk
    select disk # ( # = disk number for the disk with the efi partition)
    list partition
    select partition # (# = efi partition)
    delete partition override
    create partition efi size=260
    format quick fs=fat32 label="SYSTEM"
    assign letter="S"

    3. Afterwards, copy the old EFI contents back to the new partition (using a Linux live USB stick)

    4. Run boot-repair ( ) to fix Linux/Windows dual boot.
      My System SpecsSystem Spec

  4. #14

    Posts : 1

    Hi, I encountered a similar problem where my efi partition has become raw and i'm trying out the instruction by mintar. However when i try to format the partition to fat32, it says that diskpart encountered an error: the parameter is incorrect.
    May I know how should I solve this? Thanks
      My System SpecsSystem Spec

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Raw filesystem on EFI partition, Windows 8.1 can't boot
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