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Thread: Lost MBR, all but bootable windows partition restored.

  1. #1
    Join Date
    Apr 2007
    Beans
    226
    Distro
    Ubuntu 10.04 Lucid Lynx

    Lost MBR, all but bootable windows partition restored.

    Hello,

    Today my MBR was borked. I used SystemRescueCD and testdisk/fixpart to get all my partitions working except the bootable windows partition.

    I can't mount the problem partition even though I initially could.

    I will post info below. Please tell me what other info one might need to help me recover. I don't have recovery CDs/DVDs.

    Initially I thought all was well since everything mounted so I booted into Linux. All great. Booted into Windows, and it wouldn't boot. I then ran update-grub thinking it just needed to find the windows boot partition. Sadly, I was wrong and sadly, I didn't backup the grub.cfg before doing that (hindsight 20/20?)

    Here is my fdisk -l info:

    Code:
    dell-desktop mnt # fdisk -l /dev/sda
    
    Disk /dev/sda: 750.2 GB, 750156374016 bytes
    255 heads, 63 sectors/track, 91201 cylinders, total 1465149168 sectors
    Units = sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes
    Disk identifier: 0x17287e8c
    
       Device Boot      Start         End      Blocks   Id  System
    /dev/sda1              63       80321       40129+   6  FAT16
    /dev/sda2           81920    30801919    15360000    7  HPFS/NTFS/exFAT
    /dev/sda3   *    30801920   212738032    90968056+   7  HPFS/NTFS/exFAT
    /dev/sda4       212748857  1465144048   626197596    f  W95 Ext'd (LBA)
    /dev/sda5       212748858   422461304   104856223+   7  HPFS/NTFS/exFAT
    /dev/sda6       422461368   527317559    52428096   83  Linux
    /dev/sda7       527317623  1452565166   462623772   83  Linux
    Here it is in cylinders:

    Code:
    dell-desktop mnt # fdisk -u=cylinders -l /dev/sda
    
    Disk /dev/sda: 750.2 GB, 750156374016 bytes
    255 heads, 63 sectors/track, 91201 cylinders
    Units = cylinders of 16065 * 512 = 8225280 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes
    Disk identifier: 0x17287e8c
    
       Device Boot      Start         End      Blocks   Id  System
    /dev/sda1               1           5       40129+   6  FAT16
    /dev/sda2               6        1918    15360000    7  HPFS/NTFS/exFAT
    /dev/sda3   *        1918       13243    90968056+   7  HPFS/NTFS/exFAT
    /dev/sda4           13244       91201   626197596    f  W95 Ext'd (LBA)
    /dev/sda5           13244       26297   104856223+   7  HPFS/NTFS/exFAT
    /dev/sda6           26298       32824    52428096   83  Linux
    /dev/sda7           32825       90418   462623772   83  Linux
    sda1 is DellUtility
    sda2 is a Recovery partition (that I never could get to work in the first place to make CD/DVD disks or to even boot into).
    sda3 is the main booting Windows OS
    sda4 is an extended parition
    sda5 is Windows User data and some Program data
    sda6 is Linux OS
    sda7 is Linux Home

    my swap won't work right either so I tried deleting it, but gparted won't let me add it back even using SystemRestoreCD live.

    Here is the error I get when trying to mount:

    Code:
    ntfs_mst_post_read_fixup_warn: magic: 0x6eaca328  size: 1024   usa_ofs: 1572  usa_count: 461: Invalid argument
    Record 0 has no FILE magic (0x6eaca328)
    Failed to load $MFT: Input/output error
    Failed to mount '/dev/sda3': Input/output error
    NTFS is either inconsistent, or there is a hardware fault, or it's a
    SoftRAID/FakeRAID hardware. In the first case run chkdsk /f on Windows
    then reboot into Windows twice. The usage of the /f parameter is very
    important! If the device is a SoftRAID/FakeRAID then first activate
    it and mount a different device under the /dev/mapper/ directory, (e.g.
    /dev/mapper/nvidia_eahaabcc1). Please see the 'dmraid' documentation
    for more details.
    I would be extremely grateful for any help.

    Thanks,
    Narnie

  2. #2
    Join Date
    Feb 2013
    Beans
    14

    Re: Lost MBR, all but bootable windows partition restored.

    If i understand correctly you want to boot into win yeah?

    If so try this boot repair. Done it myself and it works in ubuntu.

  3. #3
    Join Date
    May 2007
    Beans
    12,427

    Re: Lost MBR, all but bootable windows partition restored.

    IF boot-repair doesn't work, you could be in a real bind.

    The error message means you need to run CHKDSK on the NTFS partition and there is no equivalent for that in Linux; instead, you will have to hook this drive up to a Windows PC and run chkdsk from there.
    Ubuntu 14.04, Mint 17; MS Win 8.1.
    Will not respond to PM requests for support -- use the forums.

  4. #4
    Join Date
    Jun 2009
    Location
    Chicago Suburbs
    Beans
    Hidden!
    Distro
    Ubuntu 12.04 Precise Pangolin

    Re: Lost MBR, all but bootable windows partition restored.

    I have run chkdsk from a Windows 7 repair flash drive on my XP. But only the current version Windows repair will fully repair that same version of Windows, so best to have same version.

    If you have access to another PC, or a friend with the same version.

    Make your own Windows repairCD (not vendor recovery):
    http://forums.techarena.in/guides-tutorials/1114725.htm
    Windows users only - Silverlight
    http://windows.microsoft.com/en-GB/w...em-repair-disc

    Windows 7 repair USB, Also Vista if service pack installed
    http://www.intowindows.com/how-to-re...tion-dvd-disc/
    http://www.webupd8.org/2010/10/creat...usb-drive.html
    Windows 8 UEFI repair USB must be FAT32
    http://social.msdn.microsoft.com/For...-166dddf32205/


    How to restore the Ubuntu/XP/Vista/7 bootloader Also see link to repairs
    https://help.ubuntu.com/community/Re...ta/7Bootloader
    For info on UEFI boot install & repair:
    http://ubuntuforums.org/showthread.php?t=2147295
    Please use Thread Tools above first post to close thread when/if answered completely.







  5. #5
    Join Date
    Apr 2007
    Beans
    226
    Distro
    Ubuntu 10.04 Lucid Lynx

    Re: Lost MBR, all but bootable windows partition restored.

    Quote Originally Posted by jannk View Post
    If i understand correctly you want to boot into win yeah?

    If so try this boot repair. Done it myself and it works in ubuntu.
    Sadly, it didn't work for me.

  6. #6
    Join Date
    Apr 2007
    Beans
    226
    Distro
    Ubuntu 10.04 Lucid Lynx

    Re: Lost MBR, all but bootable windows partition restored.

    Quote Originally Posted by Mark Phelps View Post
    IF boot-repair doesn't work, you could be in a real bind.

    The error message means you need to run CHKDSK on the NTFS partition and there is no equivalent for that in Linux; instead, you will have to hook this drive up to a Windows PC and run chkdsk from there.
    I downloaded a Windows environment and ran chkdsk /f. It couldn't do anything with the partition.

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