I have a problem that is quite unique, since I was unaware at the time that Windows doesn't recognize HDD's greater than 2TB unless using UEFI, it was first a problem installing windows as the PC had 2 hard drives. One was the 4TB HDD. The other, a 256GB M.2 NVMe SSD hard drive.
I ended up installing Windows on the SSD hard drive, but for some reason the computer boots from the 4TB HDD.
I now know that I need to convert the MBR to UEFI in order to get access to the extra 2TB of the hard drive, however, since space was limited on the SSD, I changed the location of "My Documents" (including My Pictures, My Videos etc.) to be on the 2TB partition of the 4TB HDD.
Now my first dilemma is, can I simply copy the files on the 2TB HDD to another hard drive in order to back up everything, or do I need to create an image of the partition before I remove all partitions and then go ahead and change the HDD from MBR to UEFI.
My second dilemma is, will the HDD boot (after I change the BIOS settings from Legacy to UEFI) from the HDD after I've deleted all partitions and changed the HDD from MBR format to UEFI? Or, as I suspect, are there some files in the first partition of the HDD which the computer uses to boot from?
Does any of this make sense, or have I made some mistakes in terminology or my understanding of how things work?