In some embodiments, a magnetic reader comprises first and second shields extending from an air bearing surface, a magnetoresistive stack is located between the first and second shields, and a flux guide is separated from the magnetoresistive stack while connecting the first and second shields. The membranes have a dense, discriminating layer and a thick, porous support layer and require no other support. One or more debugging operations may be specified for the statechart. Horizontal adjustment is controlled by choice of materials, a frictional wave spring and dampener. The electrode is a cathode and placed on a center of a partition.