Windows 8 and 8.1 Forums


Unknown file system, grub rescue

  1. #1


    INDIA
    Posts : 148
    Windows 8 RP, Windows 7

    Unknown file system, grub rescue


    Hi, i accedentally deleted volume for ubuntu in triple boot , now getting unknown file system grub rescue. Plz. Help me . My windows 8 n 7 files r extremely imp for me.
    Thanks.

      My System SpecsSystem Spec

  2. #2


    Portsmouth Hants
    Posts : 772
    Windows 8.1 Pro with Media Center


    Q1 - Exactly how did you "delete" the volume? - Was Ubuntu installed via WUBI or - in its own root partition and swap volume

    Assuming you are familiar with Linux:

    Q2 - Do you have a Live Linux CD (DVD) - Ubuntu, Mint etc that you can boot the PC from? - it does not need to be the same distro or version that you have "Deleted" - failing that, an equivalent bootable USB drive

    Q3 - If Q2 is Yes - what can you see of the disk volumes on the PC - Do you see intact windows drives, and any partition remnants from the Ubuntu distribution? In a terminal, what does sudo fdisk -l tell you?

    see here Win7-Win8 Dual boot problems my method for reinstalling grub - but I cannot comment on the state of your linux root volume
    Last edited by fafhrd; 07 Jul 2012 at 18:48.
      My System SpecsSystem Spec

  3. #3


    INDIA
    Posts : 148
    Windows 8 RP, Windows 7


    thanks 4 reply
    but the big problem is not working of my dvd rom.. Anythin dat cn b done via grub rescue commands or any way to get aces or backup data on 7 or 8. I installed ubuntu via usb .
      My System SpecsSystem Spec

  4. #4


    INDIA
    Posts : 148
    Windows 8 RP, Windows 7


    Quote Originally Posted by fafhrd View Post
    Q1 - Exactly how did you "delete" the volume? - Was Ubuntu installed via WUBI or - in its own root partition and swap volume

    Assuming you are familiar with Linux:

    Q2 - Do you have a Live Linux CD (DVD) - Ubuntu, Mint etc that you can boot the PC from? - it does not need to be the same distro or version that you have "Deleted" - failing that, an equivalent bootable USB drive

    Q3 - If Q2 is Yes - what can you see of the disk volumes on the PC - Do you see intact windows drives, and any partition remnants from the Ubuntu distribution? In a terminal, what does sudo fdisk -l tell you?

    see here Win7-Win8 Dual boot problems my method for reinstalling grub - but I cannot comment on the state of your linux root volume
    actually i knw that only boot mgr is the problem n start repair will fix it bt i hv usb only.. Can i repair with bootable usb hv windows xp.
      My System SpecsSystem Spec

  5. #5


    Portsmouth Hants
    Posts : 772
    Windows 8.1 Pro with Media Center


    Sorry, could you need to answer some questions so that we can get some idea of what is wrong.
    Bootable live Linux will see all volumes
    Bootable WinPE = windows 7 or 8 setup disk will see windows ntfs data only.
    XP setup will not repair win 7 and 8 bootmgr - but may be able to see NTFS volumes.
    Win7 setup safer than 8.

    any use?
      My System SpecsSystem Spec

  6. #6


    INDIA
    Posts : 148
    Windows 8 RP, Windows 7


    so u mean bootable windows 7 can repair problem with all three OS? Right.
      My System SpecsSystem Spec

  7. #7


    Portsmouth Hants
    Posts : 772
    Windows 8.1 Pro with Media Center


    only Windows - it will write a new bcd if you can boot to the command prompt with the windows 7 setup on usb with the shortcut Shift F10 after you have selected language and location, then
    discover the windows 7 volume with
    diskpart
    list vol
    if windows 7 is in x:\ select the disk and partition that that drive refers to, for instance disk 0, partition 2 and make that the selected disk:

    sel disk 0

    select the partition

    sel part 2

    then make it active

    active

    once it is active,

    check the volumes again

    list vol

    if all is ok,

    exit

    bcdboot x:\windows /s x:

    to write the bcd and boot files to the windows 7 volume and try to reboot
    Last edited by fafhrd; 08 Jul 2012 at 08:58.
      My System SpecsSystem Spec

  8. #8


    INDIA
    Posts : 148
    Windows 8 RP, Windows 7


    ok let me see that... Thanks anyway
      My System SpecsSystem Spec

  9. #9


    INDIA
    Posts : 148
    Windows 8 RP, Windows 7


    Good news! Fixed it myself

    What I did, created a bootable Windows 8 USB using another system. Booted to defected laptop, pressed F9, selected USB harddrive to boot.

    And luckily it ran Windows 8 RP setup. Choosed the drive which has Ubuntu installed first, but now it was free up. Installed Windows 8 RP and everything went like a charm. Very happy.

    Thanks fafhrd, for help bro . Hope this thread will benefit other users facing such horrible issue.
      My System SpecsSystem Spec

  10. #10


    Portsmouth Hants
    Posts : 772
    Windows 8.1 Pro with Media Center


    Glad you got it sorted - don't let it happen again!!
      My System SpecsSystem Spec

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