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#21
I mean do the above, before you make the change in BIOS to UEFI, and reinstall Windows.
Also, if you have more than one internal disk, unplug all but the system disk, and copy all your libraries data to an external drive, then when you are finished setting up your system drive, you can then format your other internal drives to UEFI, then put your libraries(music, documents...etc.) on your, and what ever else was on those disks.