Thanks for the suggestion Ron... but the ALFAT looks a little outta my price range

Let me rephrase the question: When you drag and drop files in windows onto an MMC card (using a standard MMC card reader), is there any way to figure out the starting address of these files or the specific address locations of the files? I am involved in an MP3 player project and am trying to use an MMC to store the MP3 files, and eventually use a PIC to transfer the data through an MP3 decoder chip.