I am a little white, by looking at the tutorial. I was in SSH working state, executing fdisk, and using ext3 and ext4 for memory card formatting partition. But it is still invalid, the whole system partition is cloned, and the SD card boot is mounted, but it still cannot be recognized normally. And the SMB protocol transfers files, the built-in storage is very slow, 200kB./ s.sd card at 20M /s