Windows 10: Convert 1.5TB disk from MBR to GPT Solved

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  1. Ztruker's Avatar
    Posts : 6,269
    Windows 10 Pro X64 17134.191
       31 Dec 2017 #1

    Convert 1.5TB disk from MBR to GPT


    I want to convert a 1.5TB MBR disk to a GPT disk. My other two disks are GPT so I'd like them all to be. No special reason, just because.
    When I tried mbr2gpt /validate /disk:2 I get

    ERROR: MBR2GPT can only be used from the Windows Preinstallation Environment. Use /allowFullOS to override.

    I can run this from WinPE but will it do what I want? My system is already a UEFI/GPY system, I just want to convert Disk 2 from MBR to GPT.

    Code:
    DISKPART> list disk
    
      Disk ###  Status         Size     Free     Dyn  Gpt
      --------  -------------  -------  -------  ---  ---
      Disk 0    Online          232 GB      0 B        *
      Disk 1    Online         1863 GB   130 MB        *
      Disk 2    Online         1397 GB  1024 KB
      Disk 3    Online           14 GB      0 B        *
      Disk 4    No Media           0 B      0 B
    Code:
    Disk 0
    Volume ###  Ltr  Label        Fs     Type        Size     Status     Info
      ----------  ---  -----------  -----  ----------  -------  ---------  --------
      Volume 1     C                NTFS   Partition    232 GB  Healthy    Boot
      Volume 2         Recovery     NTFS   Partition    499 MB  Healthy    Hidden
      Volume 3                      FAT32  Partition    100 MB  Healthy    System
    Disk 1
    Volume ###  Ltr  Label        Fs     Type        Size     Status     Info
      ----------  ---  -----------  -----  ----------  -------  ---------  --------
      Volume 4     D   Lenovo_D     NTFS   Partition    732 GB  Healthy
      Volume 5     E   Lenovo_E     NTFS   Partition    732 GB  Healthy
      Volume 6     F   Lenovo_F     NTFS   Partition    378 GB  Healthy
      Volume 7     V   KYHI         FAT32  Partition     19 GB  Healthy
    Disk 2
    Volume ###  Ltr  Label        Fs     Type        Size     Status     Info
      ----------  ---  -----------  -----  ----------  -------  ---------  --------
      Volume 8     G   Lenovo_G     NTFS   Partition    698 GB  Healthy
      Volume 9     H   Lenovo_H     NTFS   Partition    698 GB  Healthy
      My ComputersSystem Spec

  2. Brink's Avatar
    Posts : 32,398
    64-bit Windows 10 Pro build 18242
       31 Dec 2017 #2

    Hello Rich, :)

    Since this is a data disk and not the OS disk, you could use an option in the tutorial below to convert the MBR disk to GPT without data loss.

    Convert MBR Disk to GPT Disk in Windows 10 Hardware Drivers Tutorials
      My ComputersSystem Spec

  3. Ztruker's Avatar
    Posts : 6,269
    Windows 10 Pro X64 17134.191
    Thread Starter
       31 Dec 2017 #3

    Thanks Shawn. I just tried it and it said it worked but when I booted back to Win 10 the drive no shows as unallocated. All data is lost.
    Code:
    DISKPART> list disk
    
      Disk ###  Status         Size     Free     Dyn  Gpt
      --------  -------------  -------  -------  ---  ---
      Disk 0    Online          232 GB      0 B        *
      Disk 1    Online         1863 GB  1863 GB        *
      Disk 2    Online         1397 GB  2048 KB        *
      Disk 3    No Media           0 B      0 B
    Code:
    DISKPART> sel disk 1
    
    Disk 1 is now the selected disk.
    
    DISKPART> detail disk
    
    ST2000NM0011
    Disk ID: {10800FF6-5858-9090-8081-828310111213}
    Type   : SATA
    Status : Online
    Path   : 1
    Target : 0
    LUN ID : 0
    Location Path : PCIROOT(0)#PCI(1F02)#ATA(C01T00L00)
    Current Read-only State : No
    Read-only  : No
    Boot Disk  : No
    Pagefile Disk  : No
    Hibernation File Disk  : No
    Crashdump Disk  : No
    Clustered Disk  : No
    
    There are no volumes.
    Code:
    DISKPART> sel disk 2
    
    Disk 2 is now the selected disk.
    
    DISKPART> detail disk
    
    ST31500341AS
    Disk ID: {10821BFB-5858-9090-8081-828310111213}
    Type   : SATA
    Status : Online
    Path   : 2
    Target : 0
    LUN ID : 0
    Location Path : PCIROOT(0)#PCI(1F02)#ATA(C02T00L00)
    Current Read-only State : No
    Read-only  : No
    Boot Disk  : No
    Pagefile Disk  : No
    Hibernation File Disk  : No
    Crashdump Disk  : No
    Clustered Disk  : No
    
      Volume ###  Ltr  Label        Fs     Type        Size     Status     Info
      ----------  ---  -----------  -----  ----------  -------  ---------  --------
      Volume 4     D   Lenovo_G     NTFS   Partition    698 GB  Healthy
      Volume 5     E   Lenovo_H     NTFS   Partition    698 GB  Healthy
    The drive I converted from MBR to GPT is fine, has Lenovo_G and Lenovo_H on it. I lost me D: and E: partitions on drive 3. D: I have backeup up from Friday so no big deal and E: is nothing I care a whole lot about, but I wonder what happened.

    Is there any way to recover this? Probably not.
      My ComputersSystem Spec

  4. Brink's Avatar
    Posts : 32,398
    64-bit Windows 10 Pro build 18242
       31 Dec 2017 #4

    Which option did you use?
      My ComputersSystem Spec

  5. jumanji's Avatar
    Posts : 715
    Windows 7 Ultimate 32bit
       01 Jan 2018 #5

    While I do not want to intrude or involve at this stage, for my own curiosity, may I request you to post a screenshot how your drives look like in Partition Wizard? And also in Windows Disk Management.
      My ComputerSystem Spec

  6. Ztruker's Avatar
    Posts : 6,269
    Windows 10 Pro X64 17134.191
    Thread Starter
       01 Jan 2018 #6

    I used Aomei Partition Master from Kyhi's Rescue WinPE ISO. I right clicked on the disk and selected convert to GPT.

    I think this may be a self inflicted wound. The first time I tried it it failed when I clicked on Apply, though I don't remember the error message but I suspect I was on the wrong disk, the one that is now showing No volumes. It used to have D: E: F: and V: (where Kyhi's WinPE was installed).

    I'm running the complete scan of EaseUS Partition Recovery Wizard now. Taking a long time but so far has found D: which is the one I need the most. I'll let it run over night.

    jumanji, I don't want to run any other Disk Management stuff until EaseUS finishes. If it doesn't resolve the problem I post the info you requested.

    I'm going to bed.

    Happy New Year to all.
      My ComputersSystem Spec

  7. jumanji's Avatar
    Posts : 715
    Windows 7 Ultimate 32bit
       01 Jan 2018 #7

    Ztruker said: View Post
    ........I think this may be a self inflicted wound. The first time I tried it it failed when I clicked on Apply, though I don't remember the error message but I suspect I was on the wrong disk,......
    That is what exactly I was curious about. How on earth an MBR to GPT conversion carried out on a particular Disk can impact another disk!

    So now you are running Easeus Partition Recovery Wizard to recover the partitions. Fine. Please do post the screenshots at your convenience after completion.

    Data recovery from a GPT disk is always troublesome and uncertain. Prevention is better than cure. Not only for you but whoever is reading this thread, I would advise, please do save the partition structure ( the relevent sectors) as shown in bootice. In case of any partition loss leading to the disk becoming RAW, simply restoring those sectors will bring the disk alive.

    My posts #22 and 29 here explaining the GPT structure https://www.sevenforums.com/performa...titions-3.html

    How to use bootice to save and restore the significant sectors : My post #7 here https://www.sevenforums.com/hardware...ml#post2584426

    Further reading: https://www.rodsbooks.com/gdisk/repairing.html

    Happy New Year to everyone.
      My ComputerSystem Spec

  8.    01 Jan 2018 #8

    For clarity, there is ABSOLUTELY no point in converting a DATA only drive from mbr to gpt if the drive is less than 2.2TB.

    You only need gpt if over 2.2 TB or if drive contains the Operating System and converting to UEFI.

    I am afraid guys, the OP should really have been told this rather than methods how to convert drive, and then OP would not have got in a mess.
    Last edited by cereberus; 01 Jan 2018 at 05:14.
      My ComputerSystem Spec

  9.    01 Jan 2018 #9

    AddRAM said: View Post
    I didn't see the point in doing it either.

    I always keep my install drive MBR and my storage drives GPT.
    I do exact opposite - install as gpt for UEFI, and drives as mbr unless over 2.2TB.
      My ComputerSystem Spec

  10. AddRAM's Avatar
    Posts : 2,093
    Windows 7 Pro x64 Windows 10 Pro x64
       01 Jan 2018 #10

    I just like having 1 entire partition for Windows, it's so much easier to image that way.
    Attached Thumbnails Attached Thumbnails PW W10.JPG  
      My ComputersSystem Spec


 
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