Forum Discussion
How can I change mbr to gpt without data loss?
Hi, I have a Windows 10 PC but can't install Windows 11 on it because the internal hard drive is based on MBR but Windows 11 requires GPT. There are a lot of important data on this disk and I don't ...
DiskGeniius Pro, an all-in-one disk-management suite for changing MBR to GPT without losing data in Windows 11. Beyond the usual partition-resize, clone, and surface-test tools, it adds powerful extras undelete, full-image backup, hex editor, RAID reconstruction, and a WinPE builder.
A standout convenience is its ability to switch a disk’s partition style between MBR and GPT without re-formatting, so you can adopt UEFI or create more than four primary partitions while keeping every byte of data intact.
| # | Action |
|---|---|
| 1 | Install & launch DiskGeniius Pro. If converting the system disk, run the program “as Administrator” so it can schedule pre-OS operations. |
| 2 | Locate the target disk in the left-hand tree. Double-check the drive letter, size, and partition list to avoid selecting the wrong device. |
| 3 | Unload BitLocker or write-protection (if present): suspend BitLocker or disable any real-time disk guard that could lock the partition table. |
| 4 | Initiate the conversion: Menu Disk ► Convert To GUID Partition Table → click Yes when the confirmation dialog explains that all volumes will remain intact. This will convert mbr to gpt without data loss. |
| 5 | Save the change: Press Save All in the toolbar, review the pending operation, and click Execute. - If you’re converting a data disk, the change is applied instantly. - If it’s a system disk, DiskGeniius schedules the conversion in its “PreOS Mode”; allow it to reboot once, perform the swap before Windows starts, then reboot again. |
| 6 | Switch firmware to UEFI: On first restart, enter the motherboard setup (F2/Del/Esc) and change the boot mode from Legacy/CSM to UEFI. Make sure Windows Boot Manager is at the top of the boot order. |
| 7 | Verify success: Back in Windows, open DiskGeniius or diskpart → list disk—the target drive should now carry the GPT marker. Open a few files to confirm data integrity, then re-enable BitLocker or antivirus protection. |