There are some pretty neat data readers out there, where you can look at the files in their raw state, exactly as they are written to the storage media. I would format a card and put a simple .txt file on it. After which use one of these programs to open it up and examine the structure. The reason to start with a .txt file, is it is one of the simplest structures, and should be the easiest to orient yourself to the inner workings of the storage device. Check www.compsys1.com. Last I checked there was a file reader on that sight.