Mobile　hard　disk　may　be　damaged　and　lose　its　data　because　of　falling　to　ground　incautiously.　To　solve　this　problem,　a　new　mobile　hard　disk　based　on　subminiature　air　chamber　technology　was　developed,　and　theoretical　and　experimental　analysis　were　applied　to　it.　The　structure　and　working　principle　of　the　mobile　hard　disk　based　on　subminiature　air　chamber　technology　was　introduced　firstly;　Then　theoretical　analysis　was　applied　to　the　falling　process　of　the　disk,　and　formula　for　calculating　the　deformation　energy　of　the　disk　was　derived;　Finally,　a　new　experimental　equipment　which　could　measure　the　portrait　strain　value　was　designed,　and　experiments　were　applied　to　the　normal　mobile　disk　and　the　anti-shock　mobile　disk,　respectively.　The　experimental　results　reveal　that　when　the　anti-shock　hard　disk　falling　from　2.5　m　to　ground,　its　deformation　energy　equals　to　that　when　the　normal　hard　disk　falls　from　1　m　high,　thus　proves　that　the　anti-shock　performance　of　the　anti-shock　mobile　hard　disk　is　better　than　that　of　normal　one.