My car has the standard Audi MMI without built in Sat Nav and this cable plugs into the socket in the centre armrest. I use this with a standard 500GB portable external drive with about 30,000 tracks, with folders sorted by artist and album, consuming about 160GB. The cable works perfectly. Audi's systems limits the number of folders at the top level so if you have a lot of music you may need to split ito high level folders I use Artists A-M, and Artists N-Z. Also, the Audi system orders tracks by their filename, not the tagged name, so you may need to prefix all filenames with 01, 02, etc.. if you want album tracks played in the right order. Use an automatic tag editor and it should only take a few minutes.. Some cover art is displayed, but not all. This is not a fault of the cable, I get the same problem with the Audi SD card reader. It looks as if is to do with the to do with the the way the art is stored in the MP3 tag. Anyway, great cable, good price, quick delivery, it does exactly what I wanted - it is in use every day!