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！
(Personal collection of read and write SD Card FAT file system code, are very classic, and some are purchased to pay for hard to find friends with packing downloaded. Very concise, very classic, suitable for embedded system applications, such as MP3 players, bootloader to load and so on!)