MCT Repartitions USB Drive with Existing Usable 32GB Partition

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  1. Posts : 6
    Windows 10
       #1

    MCT Repartitions USB Drive with Existing Usable 32GB Partition


    MCT (MediaCreationTool22H2) just repartitioned external 5TB USB drive with existing usable 32GB partition, why would anyone think that was a good idea?

    MediaCreationTool21H2 causes mass storage device to lose data and lose This sounds like a very similar experience to mine but as it's an old thread I was asked to create a new one.



    When I first had to recover my laptop a few years ago after the SSD died, I bought a 5TB Seagate Expansion Portable Hard Drive to do the job, overkill but I needed additional backup needs

    * At the time I created a 32GB bootable partition for Windows 10 recovery (install media)
    * The second partition was used for backing up my photos 770GB

    This worked fine until

    I needed to reset my laptop again and discovered Kari's great tutorial, How to create a Windows 10 ISO image for clean, in-place upgrade and repair install

    Using Part Two: Custom ISO with pre-installed software & pre-set user accounts, I followed the instructions to the letter and all was good.



    Roll on this morning, I went to create a bootable recovery drive from the previously generated ISO on my external 5TB USB drive only to discover that altho the boot partition on which I had downloaded the latest Windows 10 install using MCT (MediaCreationTool22H2) was indeed there but more importantly, my backup partition had been wiped and replaced with 2 useless unformatted partitions of different sizes WTF?

    Perhaps I should have noticed it sooner in Part 4 of the above tutorial, not that it would have made any difference.

    Here is the output of the diskpart ===> list vols:

    Volume ### Ltr Label Fs Type Size Status Info
    Volume 0 C Data NTFS Partition 931 GB Healthy
    Volume 1 D Windows NTFS Partition 445 GB Healthy
    Volume 2 E Image NTFS Partition 19 GB Healthy
    Volume 3 Recovery NTFS Partition 499 MB Healthy Hidden
    Volume 4 FAT32 Partition 100 MB Healthy Hidden
    Volume 5 F ESD-USB FAT32 Partition 32 GB Healthy

    So it is clear that in preparing for step 4.1 and creating recent/current Windows 10 install media using the latest MCT, it had repartitioned my existing partitioned external 5TB USB drive, even tho there was already a perfectly usable bootable 32GB partition available!

    So other than reading this drive, there has been no other activity on it, what are my chances of recovering my backed up photos?


    Any help appreciated

    Cheers
    Aztrix

    OS Name: Microsoft Windows 10 Home
    Version: 10.0.19045 Build 19045




    BTW Please spare me any lectures about backups, that was my backup. Seriously, what kind of #^%#*&$ would think that wiping a perfectly usable, bootable 32GB partition was a good idea!!!
      My Computer


  2. Posts : 4,701
    several
       #2

    post a screenshot of disk management window
      My Computer


  3. Posts : 6
    Windows 10
    Thread Starter
       #3

    SIW2 said:
    post a screenshot of disk management window
    MCT Repartitions USB Drive with Existing Usable 32GB Partition-mct-0.png
      My Computer


  4. Posts : 6,659
    Windows 11 Pro - Windows 7 HP - Lubuntu
       #4

    aztrix said:
    Roll on this morning, I went to create a bootable recovery drive from the previously generated ISO on my external 5TB USB drive only to discover that altho the boot partition on which I had downloaded the latest Windows 10 install using MCT (MediaCreationTool22H2) was indeed there but more importantly, my backup partition had been wiped and replaced with 2 useless unformatted partitions of different sizes WTF?
    MCT creates a USB drive that is Legacy and UEFI boot able. To do so, the drive must be MBR.
    MCT has cleaned the drive and converted the drive from GPT to MBR and created a Fat32 partition and copied the installation files to it.
    I would say that the chances to get your data back aren't very good.

    There must be a partition between the two unallocated spaces.

    Open a CMD window as administrator and type:

    diskpart
    list disk (it will list all drives. Identify the USB drive number - Should be 2)
    select disk n (replace n by the USB drive number obtained with list disk- Should be 2)
    list part
    Exit

    Drive 2 is a MBR as it has an active partition. MBR has a 2.2T size limit.
    To make the USB drive an Win 10 installation drive and a data drive, and if you want to use all the available space the drive must be GPT.
    I suggest you start it over.
    Open a CMD window as administrator and type:

    diskpart
    list disk (it will list all drives. Identify the USB drive number)
    select disk n (replace n by the USB drive number obtained with list disk)
    clean
    convert gpt
    create part primary size=8000
    select part 1
    format fs=fat32 quick
    assign
    create part primary
    format fs=ntfs quick
    assign
    exit (to exit diskpart)

    I suggest you download a Win 10 22h2 iso file using MCT

    Mount the iso file and copy all files and folders to the Fat32 partition.
    As it is a GPT drive, Win 10 22h2 installation will only boot as UEFI to install as UEFI-GPT.

    Reset BIOS or load defaults.
    Set Disk mode to AHCI, not RAID
    Select OS mode = UEFI or Select OS mode = other + UEFI (depends on BIOS).
    Disable fast boot and secure boot (you can turn it on after installation)

    Windows can be installed in two ways: Legacy-MBR or UEFI-GPT
    To install as Legacy-MBR you must boot the installation drive as Legacy
    To install as UEFI-GPT you must boot the installation drive as UEFI.

    Detach any other drives (SATA or Power cable) from the MB.

    During POST, press F12(?) to launch the boot menu. You will see one option for the USB drive. USB UEFI (Name). Select USB UEFI (Name) to install as UEFI-GPT.
    Go to install and delete ALL partitions on the main drive till you have one and only one unallocated space and then proceed.
    If you don't want to use MS account, don't enable updates or connect to the internet during installation.
    Last edited by Megahertz; 27 Jun 2023 at 09:49.
      My Computers


  5. Posts : 4,701
    several
       #5

    what are my chances of recovering my backed up photos?
    you could try data recovery programs.

    @Megahertz

    deleting partitions at this stage might make data recovery more difiicult . Best to scan with data recovery programs fist and see wht they reveal before taking any other decisions.


    diskpart list disks will list disks, not drives.
      My Computer


  6. Posts : 6,659
    Windows 11 Pro - Windows 7 HP - Lubuntu
       #6

    SIW2 said:
    you could try data recovery programs.

    @Megahertz

    deleting partitions at this stage might make data recovery more difiicult . Best to scan with data recovery programs fist and see wht they reveal before taking any other decisions.


    diskpart list disks will list disks, not drives.
    I agree. To have any chance to recover the data on it, the drive should not be modified.

    I use the term drive as it can be a hard disk drive or a solid state drive.
      My Computers


  7. Posts : 4,701
    several
       #7

    I use the term drive as it can be a hard disk drive or a solid state drive.
    That is unfortunate.
      My Computer


  8. Posts : 1,234
    W10-Pro 22H2
       #8

    When you selected the usb drive, you were warned that all data on it would be lost
      My Computer


  9. Posts : 1,234
    W10-Pro 22H2
       #9

    ... or rather, should have been so warned
      My Computer


  10. Posts : 6,659
    Windows 11 Pro - Windows 7 HP - Lubuntu
       #10

    mngerhold said:
    ... or rather, should have been so warned
    On the MCT site it has a warning:
    - A blank USB flash drive with at least 8GB of space or blank DVD (and DVD burner) if you want to create media. We recommend using a blank USB or blank DVD, because any content on it will be deleted.
      My Computers


 

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