Abstract: 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.