Convert MBR to GPT - MBR2GPT fails with error 0x00000000

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  1. Posts : 4,451
    several
       #11

    Probably the simplest way is Delete the samsung 16gb partition.

    If it has the original win8 image it is unlikely you want it and your F4 is no longer working. Geeky types might clone it to a spare disk to play with.

    I expect diskgenius would do the job as is, but it is simpler for beginners to get rid of that samsung_rec partition and then see if mbr2gpt stops complaining.

    out of curiosity, what is the partition ID of that samsung_rec ?
    Last edited by SIW2; 12 Mar 2023 at 10:12.
      My Computer


  2. Posts : 14
    Windows 10 Pro
    Thread Starter
       #12

    Megahertz said:
    Managing and playing with partitions is a risky task. Create a drive image before you begin.

    To convert the drive from Legacy - MBR to UEFI - GPT your laptop must have UEFI BIOS. If it does, why it didn't came as UEFI - GPT?

    Are you sure the Laptop has UEFI BIOS?
    ...
    I bought the laptop in 2014, and pretty early on, I did some imaging tasks. I don't recall all the steps now but I do recall that it was originally in secure boot, and EUFI mode. I had to disable secure boot and enable CSM mode for reasons I can't remember, and it would appear that I inadvertently left it in CSM (BCD) mode ever since; when I noticed this the other day, that's when I decided I really should get it back to EUFI and secure boot.

    I was ultimately able to achieve the MBR to GPT conversion using EeaseUS Partition Master. After that, I changed BIOS to EUFI and the machine booted fine. The only thing that doesn't work properly, now, is the 'advanced recovery' mode in windows. Previously, I could go to settings / Update and Security / Recovery / Advanced Startup / Restart now, and upon restart, it would offer Continue / Troubleshoot / Turn off your PC, and the 'Troubleshoot' would offer 6 options including command prompt. Now, Troubleshoot only offers 'startup settings' and 'UEFI Firmware Settings'. But I can live with this!

    Thanks everyone for their help!
      My Computers


  3. Posts : 22,767
    Win 10 Home ♦♦♦19045.4123 (x64) [22H2]
       #13

    Steerpike58 said:
    I bought the laptop in 2014, and pretty early on, I did some imaging tasks. I don't recall all the steps now but I do recall that it was originally in secure boot, and EUFI mode. I had to disable secure boot and enable CSM mode for reasons I can't remember, and it would appear that I inadvertently left it in CSM (BCD) mode ever since; when I noticed this the other day, that's when I decided I really should get it back to EUFI and secure boot.

    I was ultimately able to achieve the MBR to GPT conversion using EeaseUS Partition Master. After that, I changed BIOS to EUFI and the machine booted fine. The only thing that doesn't work properly, now, is the 'advanced recovery' mode in windows. Previously, I could go to settings / Update and Security / Recovery / Advanced Startup / Restart now, and upon restart, it would offer Continue / Troubleshoot / Turn off your PC, and the 'Troubleshoot' would offer 6 options including command prompt. Now, Troubleshoot only offers 'startup settings' and 'UEFI Firmware Settings'. But I can live with this!

    Thanks everyone for their help!



    Good job.



    Now you just need to start using backup software (if you aren't already), then you don't "need" a Recovery Partition.

    Macrium Reflect and Bootable Rescue Media, pictures... | Windows 11 Forum


    In the lower left corner of the Macrium bootable Rescue Media, are these neat little tools...

    Power button, Command Prompt, Network, and screen shot tool.

    Convert MBR to GPT - MBR2GPT fails with error 0x00000000-image1.png







    Side note: EaseUS Partition Master, will also show you all those "hidden" Windows partitions.
      My Computer


  4. Posts : 14
    Windows 10 Pro
    Thread Starter
       #14

    SIW2 said:
    Probably the simplest way is Delete the samsung 16gb partition.

    If it has the original win8 image it is unlikely you want it and your F4 is no longer working. Geeky types might clone it to a spare disk to play with.

    I expect diskgenius would do the job as is, but it is simpler for beginners to get rid of that samsung_rec partition and then see if mbr2gpt stops complaining.

    out of curiosity, what is the partition ID of that samsung_rec ?
    I did try deleting the Samsung_rec partition, thinking that would be the solution, but that set me back a step in that MBR2GPT failed validation again. So getting rid of the 100 MB partition was the furthest I ever got with mbr2gpt.

    Sorry for being dumb, but how do I tell the 'partition ID' of the samsung_rec partition?
      My Computers


  5. Posts : 22,767
    Win 10 Home ♦♦♦19045.4123 (x64) [22H2]
       #15

    Steerpike58 said:
    Sorry for being dumb, but how do I tell the 'partition ID' of the samsung_rec partition?

    The Samsung Recovery partition will be fairly large. Somewhere between 10 and 20GB.

    RED = Samsung Recovery (Factory Restore), partition.
    BLUE = Windows Recovery partition.

    Convert MBR to GPT - MBR2GPT fails with error 0x00000000-image1.png




    These are the "standard" Windows 10 partitions (GPT disk)...
    Convert MBR to GPT - MBR2GPT fails with error 0x00000000-00000-default-windows-partitions.png


    The ones in RED are the ones you NEED... to boot Windows.
      My Computer


  6. Posts : 6,201
    Windows 11 Pro - Windows 7 HP - Lubuntu
       #16

    Steerpike58 said:
    Sorry for being dumb, but how do I tell the 'partition ID' of the samsung_rec partition?
    Open a CMD window as administrator and type:

    diskpart
    select disk 0
    list part (take note of the Samsung Recovery partition number)
    select part n (replace n with the partition number identified above)
    detail part
    exit
      My Computers


  7. Posts : 14
    Windows 10 Pro
    Thread Starter
       #17

    Megahertz said:
    Open a CMD window as administrator and type:

    diskpart
    select disk 0
    list part (take note of the Samsung Recovery partition number)
    select part n (replace n with the partition number identified above)
    detail part
    exit
    Result:

    Code:
    Partition 3
    Type    : ebd0a0a2-b9e5-4433-87c0-68b6b72699c7
    Hidden  : No
    Required: No
    Attrib  : 0X8000000000000000
    Offset in Bytes: 1029870452736
    
      Volume ###  Ltr  Label        Fs     Type        Size     Status     Info
      ----------  ---  -----------  -----  ----------  -------  ---------  --------
    * Volume 1         SAMSUNG_REC  NTFS   Partition     16 GB  Healthy
    
    DISKPART>
    I don't see 'Partition ID'. Are you referring to the 'Type' string?
      My Computers


  8. Posts : 4,451
    several
       #18

    Steerpike58 said:
    Now, Troubleshoot only offers 'startup settings' and 'UEFI Firmware Settings'. But I can live with this!

    Thanks everyone for their help!
    If you fix the recovery sequence you will get the extra options.

    reagentc /info

    to see the current state.
    --------------------------------------------------------------------------------

    too late to check the samsung_rec partition id now. Had to be done before converting, now we will never know what it was. Of course after converting the disk with a 3rd party tool it now shows as ms basic data partition.
      My Computer


  9. Posts : 14
    Windows 10 Pro
    Thread Starter
       #19

    SIW2 said:
    If you fix the recovery sequence you will get the extra options.

    reagentc /info

    to see the current state.
    --------------------------------------------------------------------------------
    When I type 'reagentc /info' I get
    Code:
    C:\Windows\system32>reagentc /info
    Windows Recovery Environment (Windows RE) and system reset configuration
    Information:
    
        Windows RE status:         Disabled
        Windows RE location:
        Boot Configuration Data (BCD) identifier: 45e8c8ee-172f-11eb-8361-b160c29486b6
        Recovery image location:
        Recovery image index:      0
        Custom image location:
        Custom image index:        0
    
    REAGENTC.EXE: Operation Successful.
    Looks like it still thinks it's sitting on a BCD disk ...?

    SIW2 said:
    too late to check the samsung_rec partition id now. Had to be done before converting, now we will never know what it was. Of course after converting the disk with a 3rd party tool it now shows as ms basic data partition.
    I'll be re-imaging my second identical laptop shortly so will figure that out. Thanks!
      My Computers


  10. Posts : 6,201
    Windows 11 Pro - Windows 7 HP - Lubuntu
       #20

    Open a CMD window as administrator and type:

    reagentc /enable
    reagentc /info
      My Computers


 

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