A system and method for handing off from a first network to a second network. Stitches in metal-3 connect metal-2 primary wordline straps to metal-4 wordline straps. When the instruction is received, the computing devices transition to an operating system independent recovery state, receive a new firmware image over the distributed network, and update the firmware with the new firmware image. A prescribed lock mechanism is provided to cover so that cover is neither opened erroneously nor changed over in operation of disc drive apparatus. The filter combination can be used in a valve block serving to receive a magnet valve.