Techniques that may utilize generic tracker structures to provide data coherency in a multi-node system that supports non-snoop read and write operations. The ice maker includes a tray member comprising an upper tray having an upper shell and a lower tray having a lower shell. The voltage source supplies a pre-charge voltage to the control gates of the floating gate transistor memory cells located in the first addressable block when data is programmed in memory cells of the second addressable block. Selecting execution of map and reduce functions based on the first and second metrics result in accelerated computations. The cleaning tape includes a non-magnetic substrate 1, surface protrusions 6 formed on the non-magnetic substrate 1 with particles 2 having a particle diameter of 10 to 40 nm at a density of 300\xd7104 to 5000\xd7104 mm2, a metal evaporated film 3 having a thickness of 10 to 200 nm and an inorganic protection film 4 having a thickness of 3 to 50 nm formed on the metal evaporated film 3. Further, in this stereo camera system, an image output processing circuit which performs predetermined image processing with respect to the stereo image acquired by the stereo optical module is provided in the stereo optical module, whereby this image output processing circuit performs a correction arithmetic operation which corrects unbalance at the time of capturing the stereo image.