网上传的FAT文件系统，但是之前的版本有系统BUG，苦心修改，加入一条空的写入命令，并且延时一定时间，可以具有普遍的移植性！-Online biography of the FAT file system, but the previous version of the system BUG painstakingly modify, add an empty write command, and delay some time, you can have a universal portabi