详细了解一下FAT文件分配表、根目录、用户数据的数据结构，只有通过详细分析这些数据结构，才能自由的存取FAT12格式的磁盘文件-Learn more about FAT file allocation table, root directory, the user data structure, and only through detailed analysis of these data structures in order to free access to FAT12 format d