This directory contains 3 file system modules: - file system ISO9660 iso9660.c iso9660.h - file system FAT12/16 fat.c fat.h - file system fat32fat32.c fat32.h file.c and file.h contains all high levels functions/macro/definition for your application. fs_variable.c contains all definitions of variables that can be shared with the all file systems. config.h must contain the definition of the file system used by your application.