To convert your disk from MBR to GPT it’s not required to use a third party software since Windows 10-Version 1703.
You can use the mbr2gpt.exe which is located under the following path: C:\windows\system32
Just open your command window as an administrator and use the following syntax:
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MBR2GPT /validate|convert [/disk:<diskNumber>] [/logs:<logDirectory>] [/map:<source>=<destination>] [/allowFullOS] |
For example, you can convert your online disk directly. Please note, however, that a misconfiguration can lead to a failure of your hard disk. Please make sure that you have a valid backup.
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MBR2GPT.exe /convert /allowFullOS |