According to some embodiments, systems and methods are provided to display contextual advertising information to a user via a communication network. The abrading particles may be monocrystalline diamond particles, polycrystalline diamond particles or cluster particles with monoerystalline and polycrystalline diamond particles. One or more further electrically conductive features are present on the circuit board. The method also includes, without pausing the IO activity, specifying a second base address for the log and setting a head pointer and a tail pointer for the log to indicate that the log is empty. A datum is defined, or positioned, at a specified interval from the predetermined alignment feature of the second cardiac complex.