@BRRABill crazy system partition that it wouldn't allow me to delete for whatever reason. I tried, believe me I tried, but it wouldn't let me select that single partition because it was too small to run the OS, at least that's what it told me
I had an issue upgrading a lot of machines to Windows 10. Had to use partition software to increase it.
Could have also blown it away, but was doing an upgrade.
Sounds like the same issue, maybe.