3TB external suddenly becomes 746GB unallocated

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  1. Posts : 19
    Win 7 x64 and Vista x64
    Thread Starter
       #31

    I intended to use the drive's full capacity when I bought it, so GPT was the order of the day from the start.

    TestDisk analyze also detects/suggests EFI/GPT.
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  2. Posts : 7,055
    Windows 7 Home Premium 32 bit
       #32

    Yep, I also saw the MSR partition in Test Disk/photoRec screenshot. But AOMEI shows it as an MBR disk that is why I am baffled.

    Anyway, let us not hurry up.

    Let us see how it goes when you hook the dock+HDD on the Windows 7 machine.
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  3. Posts : 19
    Win 7 x64 and Vista x64
    Thread Starter
       #33

    Will do.

    Once again I appreciate the assistance from everyone, hopefully it ends well.
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  4. Posts : 562
    Windows 7 Ultimate x64
       #34

    Both AOMEI and PartitionGuru seems to detect the disk as MBR but if i assume correctly, both softwares detect lost partitions by looking for NTFS boot sector signature. So there is still a chance for the disk to be partitioned in GPT scheme. A deep scan with "TestDisk" or "PartitionGuru" may detect the missing partitions but before doing that we should check and confirm whether the partitions are actually lost or it is the Vista machine which is unable to read them.

    I would like to know the result of :

    1. Whether all partitions can be accessed if the HDD is connected to the Win7 machine via dock.

    2. Whether all partitions can be accessed if the HDD is connected to the Win7 machine via a direct SATA port.
    Last edited by Anshad Edavana; 19 Jun 2014 at 22:48.
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  5. Posts : 19
    Win 7 x64 and Vista x64
    Thread Starter
       #35

    Connected drive to Win 7 machine, without the dock.

    3TB external suddenly becomes 746GB unallocated-captureall.jpg
    Partition Guru results

    3TB external suddenly becomes 746GB unallocated-capture4.jpg
    TeskDisk prompt
    Last edited by WhyAlwaysM3; 21 Jun 2014 at 11:21. Reason: added test disk
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  6. Posts : 6,458
    x64 (6.3.9600) Win8.1 Pro & soon dual boot x64 (6.1.7601) Win7_SP1 HomePrem
       #36

    Anshad is pursuing the issue with you - please continue following the directions he gi

    I am posting this as reference only, no action should be taken based on the information in this post at this point.

    Norton Partition Magic manual:
    ftp://ftp.symantec.com/public/englis...ionmagic_8.pdf

    There is a reference to a Rescue disk that might serve some purpose later.

    There is also reference to Partition Magic being in a hidden partition on the drive. I don't know if this is a red herring or not.

    For some reason I keep thinking Norton Partition magic lies to the OS and resolves the addressing itself. But I have no definitive information.

    I am of little help on this thread, so I will stay on the side lines.
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  7. Posts : 19
    Win 7 x64 and Vista x64
    Thread Starter
       #37

    Give me the bad news gently...
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  8. Posts : 562
    Windows 7 Ultimate x64
       #38

    Sorry for the late reply. Is the "TestDisk" screen shot is after a deep scan ?.

    There are two more tools ( commercial ) which might be able to detect the missing partitions so my hope is not ended yet. Please try "Active Partition Recovery" first. Trail version will let us know whether lost partitions can be recovered.

    http://www.partition-recovery.com/

    There are both normal scan and super scan options available. I would highly recommend reading the accompanying manual ( help file ) first before beginning the scan. First try "Quick Scan" and if it can't detect the missing partitions, try "Super Scan".

    User guide : http://www.partition-recovery.com/do...n-recovery.pdf

    Official Video guide : http://www.youtube.com/watch?v=tl5XgWJ3xK8
    Last edited by Anshad Edavana; 22 Jun 2014 at 00:30.
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  9. Posts : 19
    Win 7 x64 and Vista x64
    Thread Starter
       #39

    "TestDisk" was 'Deeper Scan'. Should anything else be done in TestDisk? Continue?

    I will give Active Partition Recovery a run and post results.
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  10. Posts : 562
    Windows 7 Ultimate x64
       #40

    "TestDisk" was 'Deeper Scan'. Should anything else be done in TestDisk? Continue?
    Let's first see how effective is " Active Partition Recovery". It helped me one time to recover a lost partition which is not detected by "TestDisk".

    If "Active Partition Recovery" Quick scan and Super scan fails, try "TestDisk" again but this time manually select MBR partition scheme regardless of it's advise to search for EFI partitions.
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