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Converting C Drive from MBR to GPT / Legacy Bios to UEFI (Windows 10

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Pavilion HPE 1120-a
Microsoft Windows 10 (64-bit)

My PC is a Pavilion HPE 1120-a, with an IPMMB-FM (Formosa) Motherboard. The BIOS version is 8.21 (Revision A) which supports UEFI. However, my PC is currently Legacy BIOS. 


I'm aware of a Windows 10 command prompt method to convert from MBR to GPT. However, once I do that, what am I supposed to do in my BIOS to make sure it boots the drive as UEFI and not Legacy. Otherwise it won't be able to boot.

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All the details I have read about converting from MBR to GPT, or vice-versa, claim that data retention is NOT guaranteed.  In fact, the MS instructions on this even say to completely back up the data before doing this and reload it after the conversion is done.


IF your Windows was installed in legacy mode, then why NOW are you trying to convert to UEFI/GPT?

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