I'm trying to clean install Windows 10 as UEFI, I currently have a Legacy installation with 2 MBR partitions. One for keeping OS(C) and other(E) for everything else. I'm trying to install Windows as UEFI without formatting the E: partition. I dont wonna loose the data in it. Will the 2 partitions be compatible with each other without any issues? Can I change to GPT after installing Windows? Or am I better of formatting both at once during installation?