I bought a 2010 E200 CDi Sport (W212) which comes with built in sat nav, single CD player sound system. In the glove box there is a socket and I have 4 cables that can connect to that socket. One cable is for the old style Apple connector, I can connect this to my old iPhone 4 which I use as an iPod now. The other three cables are exactly the same, each has a USB connector to allow me to connect a USB (such as a USB stick) but the number on the sticker on each cable is slightly different. I have connected my iPhone 4 to the cable and then connected that cable to the socket in the glove box. I then click on the CD button on the system, using the menu I click on 'Media' which brings up three options. Option 1 is greyed out and does not say anything, option 2 is the media interface and option 3 is the AUX. I select option 2 and it says media interface not found, it does the same when I selection option 3 which is the AUX. I have tried to plug in a regular 16gb usb memory stick, using all three USB cables and again it says media interface not found. I have tried formatting the USB stick as NTFS and as FAT32 and the same thing happens. In terms of the files on my USB, the folder structure is not complex at all: Root Artist 1 Song (mp3 file format) Artist 2 Song (mp3 file format) Song (mp3 file format) Is something missing? Am I not doing something correctly? Any help would be much appreciated... All I want to achieve is to be able to plug in my USB stick with my music and use the controls on the car to navigate through my music collection. I don't know if my system is a "command" system, as a newbie if someone does need to know that how do I find out? Also, I have had a look in the in the compartment under the centre armrest and there are not sockets or connection points in there. So the only connection point is the socket in the glove box.