Watch After the Media Center application is installed on your External SD card is automatically recognized in Media Center application on TomTom music device. In this case in every browser screen you will see two top-level directories – ‘Internal’ and ‘ExternalX’. Where X specifies external storage number (maybe in future TomTom music decide to add a second SD card) Internal will correspond to the internal memory and External – to external SD card plays TomTom music.