If you see the device but cannot open the disc, try a USB 2.0 port (black plastic inside), avoid USB 3.0 (blue plastic inside) or faster ports (red, teal plastic inside) as many USB 2.0 devices don't work properly on fast ports. If you can see the video files (VOB files inside VIDEO_TS folder), use VLC or MPC-HC to open the VIDEO_TS.IFO file. This should play the menu or the main movie, whatever is configured to do by the disc Authoring application. Exactly like inserting the disc in a standalone DVD player. Assuming the disc is unprotected you don't need any special tools to copy the files in your hard disk. Just copy-paste the VIDEO_TS folder. If you prefer a single MP4 file instead, download Avidemux and open the first VOB file of the movie (usually VTS_01_1.VOB). Avidemux will detect the rest files and offer to append them, reply yes and proceed. You can either copy both video and audio at the original quality without re-encoding, or you can convert to AVC or HEVC. Use hardware acceleration, such as nVidia AVC for much faster compression.
