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With Windows 11 debut, security measures are raised to require Secure-Boot with TPM 2.0.

If you find yourself with a system that is on LEGACY/MBR (not on UEFI/GPT but) then you need to convert to UEFI/GPT.

Note that there can only be a maximum of 3 primary partitions on the disk; so that the process can add a 4th.

First validate the conversion:

• -boot to recovery
• -select COMMAND-PROMPT
• -mbr2gpt /validate

If it validates, then try the conversion:

• -mbr2gpt /convert

If it fails and you are on a Dell system, this is because Dell has a recovery parition on the disk. Try the following:

• -mbr2gpt.exe /convert /disk:0 /map:222=ebd0a0a2-b9e5-4433-87c0-68b6b72699c7

The command says that the conversion should take place but keep the disk as a BASIC disk rather than a DYNAMIC disk. This is the number part of the command.