[en] We report the observation of a disruptive instability when a high density cold plasma (n sub(e) -- 10¹⁴ cm^-3, T sub(e) -- T sub(i) -- 5 eV, βsub(max) -- 10%) is injected into the ASMIC-I symmetric mirror. The azimuthal mode number of the disruption is m = 0. When the plasma disrupts, it escapes both across and along the magnetic field lines. This disruption is observed only when the resistive drift instability grows near the surface of the plasma. We can suppress the disruption when the resistive mode is stabilized. (author)