I just converted my Windows system disk from MBR to GPT.
Windows now has this tool, which failed to validate for me, saying it couldn't find my OS:
So instead, I used MiniTool Partition Wizard to convert from MBR to GPT:
My final disk layout has 3 partitions:
Can I delete the old
[System] partition at this point?
It would be nice to remove it from the Clover bootloader screen, and the extra 350MB of space would be a bonus.