I recently bought a Sony RDR-HXD870 DVR. I have a Sansa mp3 player (flash memory), which when connected to the DVR via the USB port shows the message "Connected", but is not recognised by the DVR. When I tried an older mp3 player (not a Sansa) it worked. I would prefer to use the Sansa to transfer songs to the hard drive as it has a much larger capacity. Any suggestions/fixes?