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Convert SSD or Hard Drive from Legacy to UEFI without losing DATA

Started by branx86, October 11, 2025, 05:54:13 PM

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branx86

October 11, 2025, 05:54:13 PM Last Edit: October 11, 2025, 05:57:24 PM by branx86
Use this if you need to convert a working windows install from Leagcy Bios to UEFI Bios without reinstalling windows.

To restart windows 11 Goto System > Windows Update > Advance Options > Recovery > Advanced Recovery > Restart
Once in the windows menu choose Troubleshoot > Advance Option > Command Prompt

1st. mbr2gpt /validate /disk:(your OS disk number) normally 0
2nd. mbr2gpt /validate /allowfullos /disk:(your OS disk number)
3rd. mbr2gpt /convert /allowfullos /disk:(your OS disk number)

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