USB_document\4.5万透视FAT32系统.pdf ............\FAT32文件系统.pdf ............\fatgen103.doc ............\usbmass-ufi10.pdf ............\usbmassbulk_10.pdf ............\usbmassover_11.pdf ............\usb_mass.pdf ............\USB_OTG_FS.pdf USB_document