My experience is that the Media Player cannot actually play MP3's stored on a USB connected device -- I could copy files to and from and I could play the MP3's when I copied them onto the memory cards in my N81- but I couldn't get them to play properly when playing them directly from the attached device. They stalled and stuttered. My guess was that there was some internal bus bandwidth problem when using the DSP and the USB interface at the same time. I would be interested to hear if it works for anyone else. Graham