i turned on my R4 the other night and the DS health and safety screen came up and then the GUI came up and i selected moonshell. when game loading screen came up, the top screen started flashing all different colors and nothing happened. I rebooted and it gave me the "cannot find DS_menu.DAT file" error. i took out my card to investigate. i emptied the card and tried to add the files back on. the card is empty, but it says that theyr is only 100.8 Mb left. wtf? any help? thanks.