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Will converting MBR to GPT erase all the disk partitions

  • Question: I bought a 3TB external hard disk 2 months ago, which was initialized to MBR since I did not know limitations of MBR at that time. Then, 3 partitions were created with leaving 750GB unallocated space. Now, I want to extend the very 750GB space to each partition but even failed to extend it to its neighboring partition. Then, I googled and found MBR supports the maximum size of 2TB disk and was suggested to convert the current disk to GPT. Will converting MBR to GPT erase all the disk partitions? I don’t want to delete any partition since all partitions are saving important files.

    Ways to Convert MBR to GPT

    In general, there are 3 ways to complete this operation:
    1.Delete all existing partitions and then convert disk to GPT disk with Windows Disk Management.
    2.Convert via DiskPart. First of all, users need to note down the number of disk which will be converted to GPT. Then, take these operations: open command prompt, type in diskpart and press Enter, type in list disk and press Enter, type in select disk * (* represents the number of the target disk) and press Enter, type in convert gpt and press Enter, and finally type in exit to quit from the program. Now, to convert MBR disk to GPT disk is completed.
    3.Convert with third party partitioning tool. Here, we take the free partition manager MiniTool Partition Wizard for example.

    Converting MBR to GPT with MiniTool Partition Wizard

    Step 1: launch the program to open its main interface:



    Step 2: select the target disk and click on "Convert MBR Disk to GPT Disk" from the left panel.



    Step 3: click on "Apply" button to apply all changes.

    Now, we convert MBR disk to GPT disk without erasing any partition. As a matter of fact, by using this free partition manager, users can make use of the remaining unallocated space without converting MBR disk to GPT disk. Just extend it to a partition with the function "Extend Partition". Just have a try.