Convert MBR To GPT HDD/SSD without loosing data


  1. Ulysses
    Posts : 55
    Windows 10 LTSC (version: 1809)
       New #1

    Convert MBR To GPT HDD/SSD without loosing data


    Greetings community,

    I wanna know safety guide how to convert MBR to GPT without loose data on it?

    Any guides will help me much.

    Thanks.
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  3. dalchina
    Posts : 42,991
    Win 10 Pro (22H2) (2nd PC is 22H2)
       New #2

    Hi, there's a tutorial in the huge searchable Tutorial section here which you're free to browse and search.


    Naturally you will take precautions before attempting this- ensure you have a full disk image of all partitions (e.g. Macrium Relfect - free/paid), or perhaps a clone.
    Last edited by dalchina; 29 Nov 2021 at 09:42.
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  4. nIGHTmAYOR
    Posts : 1,310
    Windows 10
       New #3

    Best Free Partition Manager for Windows | MiniTool Partition Wizard Free
    You just right click the hard drive in preview area then choose convert from MBR to GPT then Apply from left bottom . It takes 5 seconds on a full HDD and less on an SDD .

    On a side notice reversing the operation , i.e converting GPT to MBR might risk losing data if the HDD is above 3.5 TBs of data as this is the max data MBR can handle , so the rest will just vanish .
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  6. Megahertz
    Posts : 6,320
    Windows 11 Pro - Windows 7 HP - Lubuntu
       New #4

    The computer must have UEFI BIOS
    Under Windows many things can make it go wrong. Like antivirus.
    Backup your drive. Better be safe than sorry
    I always suggest to do under Windows PE
    Boot from a Win 10 installation drive, open a CMD window and type:
    mbr2gpt \validate
    If ok type
    mbr2gpt \convert

    Convert Windows 10 from Legacy BIOS to UEFI without Data Loss

    Restart, enter BIOS and change from Legacy boot to UEFI boot. (Depends on BIOS type)
    Reboot
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