In this post, you’ll learn more about the Error ERROR_VOLMGR_PLEX_NOT_SIMPLE – 0xC0380040 that is returned when working with the COM-based APIs in Win32
Win32 COM Error
ERROR_VOLMGR_PLEX_NOT_SIMPLE – 0xC0380040
Win32 COM Error Error Description
The operation is only supported on simple plexes.