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Thread: Strange Partition Table

  1. #1
    Join Date
    Mar 2013
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    1

    Strange Partition Table

    I am a newbie to Linux and have Ubuntu and Windows8 on my computer. Several days ago my computer crashed with disk errors and I have to reinstall Ubuntu. I used Acronis Disk Utility in Windows to delete and format the spaces where Ubuntu used to be. These regions now appears to be unallocated under windows. In live Ubuntu, however, gparted cannot recognize the partition table and reports overlapping. The output of the fdisk -l command shows a strange partition table, where /dev/sda1 spans the entire disk.
    Does anybody have some ideas to fix this problem?
    Thank you!
    ################################################## ###################
    Disk /dev/sda: 500.1 GB, 500107862016 bytes
    255 heads, 63 sectors/track, 60801 cylinders, total 976773168 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: 0x9bf9cbf0

    Device Boot Start End Blocks Id System
    /dev/sda1 191816100 948092039 378137970 5 Extended
    /dev/sda2 * 730288192 939384809 104548309 7 HPFS/NTFS/exFAT
    /dev/sda3 948099072 976771071 14336000 7 HPFS/NTFS/exFAT
    /dev/sda5 191816169 527381819 167782825+ 7 HPFS/NTFS/exFAT
    /dev/sda6 939384873 948092039 4353583+ 82 Linux swap / Solaris

  2. #2
    Join Date
    Aug 2011
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    343
    Distro
    Xubuntu 14.04 Trusty Tahr

    Re: Strange Partition Table

    It appears your utility created an extended partition and put everything else in it. A disk can have only four physical partitions. That is why most of the time you will find the last (fourth) partition being what is called an extended partition. In there are logical partitions. You look at them as partitions, but the system really does not. You can have as many logical partitions in the extended partition as you wish since they are not real partitions. That is why the partitions appear to be overlapping. If you actually map it out, you will find that sda2-6 all lie within sda1. Of course they, the logical partitions, are treated for our purposes as real physical partitions. If fdisk in Linux is reporting the actual layout as you describe, gparted should also. It may complain that there is only an extended partition, but it should still show and work with what is there. Based on this, what is really being shown? Is gparted really not identifying anything and giving up or what?

  3. #3
    Join Date
    Apr 2011
    Location
    Mystletainn Kick!
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    6,926
    Distro
    Ubuntu

    Re: Strange Partition Table

    Your partitions just look weird.

    Look over this page to see if it will help:

    http://www.rodsbooks.com/fixparts/
    Splat Double Splat Triple Splat
    Earn Your Keep
    Don't mind me, I'm only passing through.
    Once in a blue moon, I'm actually helpful
    .

  4. #4
    Join Date
    Feb 2013
    Beans
    3

    Re: Strange Partition Table

    Gparted only shows an entire disk (500GB) without partition. And for this reason, I could not install it to the desired "partition". Is there any solutions?

    Thank you!

  5. #5
    Join Date
    Apr 2011
    Location
    3rd Rock from the Sun
    Beans
    Hidden!
    Distro
    Ubuntu Development Release

    Re: Strange Partition Table

    Can you boot Windows8?

    You should read the link in post #3 about FIXPARTS. It is a utility to fix faulty or corrupt partitions and partition tables.

    After running fixparts you can use Gparted from Ubuntu LiveUSB/DVD to recreate the partitions. If you are installing Windows then I suggest you use Windows Install disk to create and format Windows partitions.
    Last edited by fantab; March 24th, 2013 at 06:41 AM.
    "Evolution is Nature's way of issuing upgrades."


  6. #6
    Join Date
    Jun 2009
    Location
    SW Forida
    Beans
    Hidden!
    Distro
    Ubuntu 16.04 Xenial Xerus

    Re: Strange Partition Table

    +1 on fixparts.

    While your actual partitions by sectors do not seem to overlap, you cannot have a primary partition sda1 thru sda4 inside the extended partition. It looks like sda2, a primary is inside sda1, the extended. Fixparts should sort that out.

    I might make a backup of partition table first.
    First backup partition table.
    sudo sfdisk -d /dev/sda > parts_sda.txt
    For more info on UEFI boot install & repair - Regularly Updated :
    http://ubuntuforums.org/showthread.php?t=2147295
    Please use Thread Tools above first post to change to [Solved] when/if answered completely.

  7. #7
    Join Date
    Feb 2013
    Beans
    3

    Re: Strange Partition Table

    Thank you all! The problem is finally solved by fixparts.

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