I've got a Server 2012 R2 VM running as an SMB file host (VHDx on Host side.) Recently, I noticed that both the system disk and the data disk have duplicates showing in "My PC":
I: is a clone of C:, and J: is a clone of D:. They both appear to be some kind of read-only snapshot. i.e. if I add/delete data to/from C: it doesn't show up in I:.
The SUBST
command shows nothing.
Shadow copies are disabled for the disks (and was never turned on by me.)
I did recently enable the Data Deduplication service for D:, but this may be a coincidence.
Internet searches have not revealed any info about this situation (searching for "duplicate disks" is filled with unrelated problems.)