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Thread: NTFS Windows partition broken by dd | gzip backup and restore

  1. #1
    Join Date
    Aug 2007

    Exclamation NTFS Windows partition broken by dd | gzip backup and restore

    Hey guys,

    I'm repairing a broken OS for a friend. My plan was to follow the idea shown on this website

    What I did was install XP Pro, some software and service packs, then install ubuntu 8.10. My partitioning table is as follows:

    Disk /dev/sda: 60.0 GB, 60011642880 bytes
    255 heads, 63 sectors/track, 7296 cylinders
    Units = cylinders of 16065 * 512 = 8225280 bytes
    Disk identifier: 0x41ab2316
       Device Boot      Start         End      Blocks   Id  System
    /dev/sda1               1           7       56196   de  Dell Utility
    /dev/sda2   *           8        4870    39062047+   7  HPFS/NTFS
    /dev/sda3            4871        7296    19486845    5  Extended
    /dev/sda5   *        4871        6086     9767488+  83  Linux
    /dev/sda6            6087        7180     8787523+   b  W95 FAT32
    /dev/sda7            7181        7296      931738+  82  Linux swap / Solaris
    Where sda2 is windows, sda5 is linux, and sda6 is a restore partition holding the file xp.img.gz

    The commands I ran (as root) were:

    umount /dev/sda2
    dd if=/dev/sda2 conv=sync,noerror bs=64K | gzip -c > /restore/xp.img.gz
    gunzip -dc /restore/xp.img.gz | dd of=/dev/sda2 conv=sync,noerror bs=64K
    Upon writing the image back to sda2, I can no longer mount the partition, and windows complains of a disk read error. I also saw after unzipping that /sda2 was flagged bootable where it hadn't been before so I changed it back.

    Here's what I get from trying to mount the partition:
    prodigy@prodigy-laptop:~$ sudo mount /dev/sda2 /windows
    mount: you must specify the filesystem type
    prodigy@prodigy-laptop:~$ sudo mount /dev/sda2 -t ntfs /windows
    $MFT has invalid magic.
    Failed to load $MFT: Input/output error
    Failed to mount '/dev/sda2': Input/output error
    NTFS is either inconsistent, or you have hardware faults, or you have 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 you have SoftRAID/FakeRAID then first you must activate
    it and mount a different device under the /dev/mapper/ directory, (e.g.
    /dev/mapper/nvidia_eahaabcc1). Please see the 'dmraid' documentation
    for the details.
    Please help me figure out what went wrong with this procedure. Hopefully I can recover all the work that I put into the windows OS!
    Last edited by scs217; April 5th, 2009 at 02:30 PM.

  2. #2
    Join Date
    Aug 2007

    Re: NTFS Windows partition broken by dd | gzip backup and restore


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