A liquid ejecting head includes a flow passage forming substrate that includes a plurality of pressure generating chambers juxtaposed to each other and each in communication with a nozzle for ejecting droplets, and piezoelectric elements disposed on the flow passage forming substrate with a diaphragm interposed therebetween. The LEDs are activated by a magnetic reed switch positioned between an inside liner and an outer liner of the cooler. The computer then compares the new file data to the current file data to obtain a measure of the difference between the current and the new file data, and if the difference exceeds a threshold, the computer considers this to identify a file encryption attack. Each blade set has a vertical axis extending upward in relation to the housing. The noise reducing circuit then selects either one of the subject pixel data and mean value in accordance with the difference and threshold. A process for manufacturing the device, as well as experimental data concerning its performance are also given.