Due to the increasing data transfer rates in hard disk drives, the crosstalk has become a source of operation failures during electrical and magnetic testing. In order to reduce this detrimental effect, the differential mode signal system of high-speed and high-density interconnects based on a new magnetic technique is proposed. The scattering parameters are evaluated in terms of the crosstalk and the transmission parameters, and then calculated using the 3D full wave simulation software. From the results, it is found that the proposed technique can suppress the near-end crosstalk and far-end crosstalk in a wide range of 1–20 GHz. In addition, the transmission signal levels from the proposed structure are still comparable to the conventional structure. Hence, the proposed technique provides an effective reduction of crosstalk, while maintaining the comparable transmission signal in a wide range of frequency.