说明：  这可是好东西，我自己编写的基于51单片机的SD卡驱动代码，可以读写扇区，假如套上FAT32驱动，则可以直接识别文件系统，缺点是用51速度比较慢。
(This is a good thing, however, I have written 51 MCU-based SD card driver code, you can read and write sectors, if put on FAT32 drives, you can directly identify the file system, 51 speed disadvantage is relatively slow.)