Hypervisors are a new technology in the industry that enable multiple Operating Systems to co-exist on a single client. On the other hand, the pad oxide film and the silicon nitride film on the reverse surface of the wafer are removed, so the whole area of the reverse surface is exposed. Two fixed contact blades are disposed on the bottom panel and each has a fixed contact attached thereto in opposition to a corresponding one of the movable contacts with the end portion of each fixed contact blade extending out through the bottom panel to define a terminal. Each contact has a contact portion extending into the mating slot for electrically connecting with a plug. The method also includes the steps of forming a substrate opening from the backside to the substrate contact, and then bonding the conductive interconnect to an inner surface of the substrate contact. Alternatively, the above length of time of each of the first and second operations is made equal to an integer multiple of the above period.