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The partition you’re talking about is called an MSR partition. It is created automatically at the beginning of every disk initialized as GPT by Disk Management or Diskpart running within full Windows. (On GPT disks that will have a Windows partition, it is created after the EFI partition.) For some reason, neither Disk Management nor Diskpart actually show that partition, although as you’ve found, Reflect does. There’s nothing you can or really should be doing about it, and again you’ll see it more often since it’s a standard partition. So just leave it there. As you note, it’s only 16 MB.