I'm using the "C" port on my '21 for the media. I got a "C" because 1) I wanted the standard port for charging cords and 2) I mistakenly assumed the "C" would be better transfer rate. I have the media stick constantly in the car's USB port and sometimes it can take up to 5 minutes for it to index the whole drive and be ready for use. Maybe you need to give the system more time to index the drive- how much media are you trying to load? Maybe try just a few songs to make it go and then expand?
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