In a tunneling magneto-resistance element, first and second free magnetic layers have a magnetization direction according to storage data. The device includes an anode, an organic layer disposed over the anode, a layer comprising an alkaline metal compound disposed over the organic layer, a layer comprising Mg or a Mg-metal alloy disposed over the layer comprising an alkaline metal compound, and a layer comprising a transparent conductive metal oxide disposed over the layer comprising Mg or Mg-metal alloy. Traversing all host initiator ports finds a host port with no or the least traffic load for a tape reservation request. The body has a first bore extending through the wall along a traverse axis substantially perpendicular to the longitudinal axis at a first position and second position.