A patterned perpendicular magnetic recording disk has a Co-alloy recording layer patterned into discrete data islands arranged in concentric tracks and exhibits a narrow switching field distribution. A certification authority in the digital certificate is compared against a list of registered trusted certification authorities in the registry. The nose bridge may further include a connecting element for connecting the electronic components with the electro-active lenses for altering optical properties of the electro-active lenses. The second and third interconnect circuits connect to the storage element sets to provide data sets to the fourth interconnect circuit, which, in turn, provides the received data to the particular reconfigurable circuit.