A system has a plurality of electronic components that are powered by a power source, and each of the components is associated with a respective power cap. The reader unit includes an elongated piece of transparent material formed with a longitudinal emit lens that is disposed to focus light from internal LEDs onto the data card. Use of an integration scheme having defined message types and specified query response framework provides for real-time response and easy adaptation for cross-vendor communication. The head gimbal assembly further includes a gimbal conductive layer disposed upon the gimbal and formed of a conductive material having a second oxidation rate lower than the first oxidation rate. When the multilayer circuit board is received in the receiving hole, the conductors are in contact with the contacts.