In this post, you’ll learn more about the Error ERROR_VOLMGR_PLEX_INDEX_DUPLICATE – 0xC0380039 that is returned when working with the COM-based APIs in Win32
Win32 COM Error
ERROR_VOLMGR_PLEX_INDEX_DUPLICATE – 0xC0380039
Win32 COM Error Error Description
The same plex index was specified more than once.