# mount -t vfat /dev/usb2 /mnt/usb
mount: Mounting /dev/usb2 on /mnt/usb failed: No such file or directory
# mount -t vfat /dev/usb2 /mnt/
mount: Mounting /dev/usb2 on /mnt failed: No such file or directory
# mount -t vfat /dev/usb1 /mnt/usb
mount: Mounting /dev/usb1 on /mnt/usb failed: No such file or directory
# mount -t vfat /dev/usb3 /mnt/usb
mount: Mounting /dev/usb3 on /mnt/usb failed: No such file or directory
#
全失败,设备不叫USB1之类的吧?