Here’s why: By default, Device Manager only displays drivers of connected devices so the drivers you see in Device Manager aren’t the only USB storage drivers that are really there! You probably still have drivers installed for devices you once connected then disconnected long ago! One possible cause of USB Mass Storage Device problems: Windows can get “confused” by all the old (and sometimes conflicting) USB storage driver data that tends to collect and remain installed on a PC * Digital audio players & portable media players * External hard drives and optical drives, including CD and DVD drives
