i have an old WORKING RD1070 player. i have a 256MB Sanisisk SD card, but the player doesnt seem to read the files on the card. the card icon is steady, not flashing. the card is not damaged. is there a directory i need to put files in? or is there a way i can upgrade the player without the usb cable? like anything on the card. i dont know which cards are compatible or not. does anyone know anything that could help? Thanks.