Windows 8 and 8.1 Forums

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

  1. #1

    Posts : 5
    Windows 8.1

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

    Hi everyone.
    My CPU recently blew up. I had it changed but Windows can't boot since. I get error 0xc0000001 with \EFI\Microsoft\Boot\BCD missing or corrupted. From recovery USB, startup repair and bootrec /rebuildbcd failed. Then, trying to use bcdedit, I realized that diskpart lists my EFI boot volume as RAW and I can't cd to it. So I think I may have a bigger problem than a corrupted BCD file.

    I use a dual boot with Xubuntu, and the EFI boot partition shows as fat32 in Gparted. I may also have messed up the bootcat.cache file, but I think it is ok. My hard disk is hybrid SSD.

    So my questions are:
    1) Is it possible that while blowing up, my CPU somehow messed up my hard disk file systems?

    2) Is there a way to make Windows see my EFI boot volume as FAT32 again?

    3) Have I got it all wrong and there is an other way to deal with it?



      My System SpecsSystem Spec

  2. #2

    What do you mean by "Blew Up"? Also, if it was very close to your hard drive, then yes. The heat may have messed the hard drive up. You can always get a new hard drive AND you have to make sure that you everything is compatible.
      My System SpecsSystem Spec

  3. #3

    Posts : 5
    Windows 8.1

    Sorry I should have used other words than "blew up". It is not like the CPU exploded ... it just stopped working. The computer crashed suddenly while I was watching a video, and then the computer did not boot anymore.

    The hard drive seems to work properly. Now that the CPU was changed, I can use my linux OS and even access all the files on my Windows partition from it. It is just that the EFI (SYSTEM_DRV) and LRS_EPS volumes appear as RAW. I am hence unable to access them or use them to boot Windows. Strangely enough, my GRUB bootloader (grubx64.efi) is also on the EFI partition and is accessed while booting linux.
      My System SpecsSystem Spec

  4. #4

    How big is the partion? (For windows)
      My System SpecsSystem Spec

  5. #5

    Posts : 5
    Windows 8.1

    The Windows partition is 213 G, as I wanted 200 G on linux and this is what was left. I attach a screen shot of my drive partitions on GParted from linux.
    Click image for larger version

    The partition with label SYSTEM_DRV is the boot partition and is the one that appear as RAW in Windows.

    Thank you. Sorry for the delayed answer, I'm in China right now and it was night.
      My System SpecsSystem Spec

  6. #6

    This may help.

    Dual Boot - Delete a OS - Windows 7 Help Forums

    If you want to either re-install windows or re-install linux. Make sure to use you cd-disc for windows/linux (however you installed it)
      My System SpecsSystem Spec

  7. #7

    Posts : 5,357
    7/8/ubuntu/Linux Deepin

    Whereabouts in China are you?

    Have you tried a bootable windows based (winpe) partition manager ?
      My System SpecsSystem Spec

  8. #8

    Posts : 5
    Windows 8.1

    I'm in Wuhan, province of Hubei. It is very hot right now!

    Thank you guys for your advice. Sadly, I can't use the dual boot tutorial from Windows 7 forum, as it uses EasyBCD, which they say should not be used with UEFI. WinPE looks great, but if I understood correctly it is not free. So I would rather reinstall everthing from scratch with my free Windows recovery disc.

    Anyway, following links in the websites you pointed out led me to testdisk TestDisk Step By Step - CGSecurity which I thought might help me clean my partitions. The output of testdisk suggests me that my disk partitions are REALLY messed up. It shows like if I had 50 partitions, with like 15 copies or my boot partition.
    Click image for larger version

    I don't know how this happened or if it was a result of my broken CPU. So i'll just go ahead and try to format and reinstall everything from scratch with my recovery disc. Sorry, I know it is a disapointing workaround.
      My System SpecsSystem Spec

  9. #9

    Posts : 50
    win8 64bit

    I am afraid you have to reinstall windows if you have not taken backups
      My System SpecsSystem Spec

  10. #10

    Posts : 2,613
    Windows 3.1 > Windows 10

    Boot into windows 8.1 setup media
    when on the "install" screen press Shift+F10 to bring up a command prompt
    Type the following>

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

    assuming C is still the drive letter assigned to your windows 8.1 partition

    C:\Windows\System32\bcdboot C:\Windows
      My System SpecsSystem Spec

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

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