A magnetic write head configured for high data rate operation has first and second pole pieces, a write gap formed between the first and second pole pieces, and at least one long and narrow magnetic column extending between the first and second pole pieces which is magnetically in parallel with the write gap. The control circuit is configured to provide a first switching control signal to turn ON and turn OFF the first switch, and when the switch mode power supply works in a power saving mode, the first switch is turned ON if a voltage feedback signal is less than a reference voltage and a current flowing through the second switch is less than a bias current. A similar technique can also be used to uniquely identify extensions to existing types and namespaces developed by external parties without causing binding name clashes. The negotiated pseudowire is then used to transport content for a communication session over the network. The affinity regions include photochemically altered regions of a material surface and physical members patterned on the material surface that exhibit a greater affinity for endothelial cell binding and migration than the remaining regions of the material surface.