I have purchased a Sandisk 4gb SD card for use with the RNS-E data card slots. I have dragged and dropped a number (about 100) of mp3 music files onto the card. When I insert this into the RNS-E I get the message "Loading card....do not remove". After 10/15mins I am still getting this message. Is this right and I am just being impatient or am I doing something wrong? I have checked and the card is formatted as FAT 32 Any advice would be much appreciated.