This is on a Win 10 Pro 64-bit laptop.
In the attached screenshot you can see that I have three small partitions called "Healthy (EFI System/OEM Partition)".
It's been quite a while since I've been in Disk Management, but the last time I was, I'm quite sure those weren't there. I recently started a Windows reinstallation a couple of times but stopped it before I was committed to the operation, so I'm wondering if those were created as a result of that. Just a guess...