System (Windows XP Home) can't see any disk in drive, neither Software installation DVD nor blank DVD-RW. Get message "insert a disk into drive D:". Drive "D" recognized as a DVD-RW drive. Device mgr lists drive as "Pioneer DVD-RW DVR-109", Driver :Microsoft, date 7/1/2001, Driver version 5.1.2535.0. I attempted to and apparently successfully updated firmware to 1.40.