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  • You are right,but why I can directly mount a mounted device without --bind?
    – illiterate
    Commented Sep 3, 2018 at 13:38
  • because with --bind you mount folder not device
    – schweik
    Commented Sep 3, 2018 at 13:39
  • 1
    A bind mount is analogous to a hard link. They allow to create multiple paths that refer to (portions of) the same filesystem. See unix.stackexchange.com/a/346460/147970 for details.
    – cg909
    Commented Sep 3, 2018 at 13:51
  • I'm sorry,but see my example code update @schweik
    – illiterate
    Commented Sep 3, 2018 at 16:28