说明：  个人收集的读写SD卡FAT文件系统的代码，都是极其经典的，有些是付费买来的，给苦苦寻觅的朋友一起打包下载载了。非常精简，非常经典，适合做嵌入式系统应用，如MP3播放，bootloader加载等等！ 已通过测试。
(Personal collection of code to read and write SD card FAT file system, are extremely classic, some are paid to buy, to struggle to find a friend with the download package contains. Very concise, very classic, suitable for embedded system applications, such as MP3 players, the bootloader to load! Has been tested.)