Help Help Help This needs attention Memory card for R4 Gold not working

Hi there
Im wondering if someone can help me on a problem I have you see Im using my mac happily and i have used it for my R4
then suddenly my memory card thinks I have less memory than I have. It is a 2GB memory stick I erased every file. But one that has chines then to random letters that change every time i look at it then Heart Gold.s but it thinks I have 16.3 mb left on it. Apparently this file has zero k bytes
Please help me
Thanks in advance

Format your SD Card using Panasonic SD formatter. Do a full overwrite format.