有关单片机读写U盘的资料，包括USB相关的协议UFI、CBI等，以及FAT12/FAT16/FAT32/NTFS文件格式，硬盘数据结构-Single-chip U disk read and write the relevant information, including the USB-related agreements UFI, CBI, as well as FAT12/FAT16/FAT32/NTFS file format, hard disk data structure