A system and method for determining the location of human faces within a color graphics image is disclosed. Iterative decoding employs a constituent maximum a priori decoder for each constituent encoding of information of the encoded signal. The present invention includes a clamping mechanism for rigidly clamping the PCB to the head disc assembly so that any shock is properly transmitted from the HDA to the PCB and then to the shock sensor. A destruct instruction is transmitted to the RFID tag. At least a portion of the blade is precurved. Compaction of optical packets may alternatively be employed for resolution of bandwidth contention.