I have two computers running Windows 10. Just today, I noticed that both of them have an additional volume with a drive letter assigned to them (one of them named "Local Disk (G:)" with 68.9 free of 95.0 MB, and the other named "SYSTEM (F:)" with 70.6 MB free of 96.0 MB). When attempting to open both of them, I receive the same error: "You have been denied permission to access this folder." Adding to the confusion, neither computer has this new volume listed in Disk Management.
Has anyone else come across this? Is it time to wipe, or is it part of a recent Windows 10 upgrade?