My Canon SD memory card SDC-32m (it's 32 megabytes). There is nothing on it but when I take/took about a 16 second video to kind of test because it had done this before, it says "MEMORY CARD FULL"!! Is it normal that it's full with that on it? I checked the memory card on the computer, there is nothing! Any advice I need it for tomorrow!! HELP ME PLEASE!