Cooling is important. There are various components of the modern computer that get hot - the CPU, the processors on modern video cards, and high speed hard drives, for instance. They're made to run warm, but they're not made to run too warm. If your CPU overheats your computer will crash; if your hard drive overheats you can lose data. At temperatures below the immediate-malfunction level, components can suffer shortened life spans; this is especially true of things with moving parts, like drives. Forget efficiency and life span - laptops can be flat out uncomfortable when they're running at their normal hot-dog-warmer temperatures, if they're actually sitting on your lap. Better laptops are engineered throughout to tolerate alarming operating temperatures, as are the major components of even the cheapest current portables, but that doesn't mean those tiny hard drives and low-power CPUs actually enjoy broiling. Iis a simple idea. You plug it into the PCMCIA slot of a laptop, and it draws power from USB port to spin its little fan and blow air into the laptop and the laptop will run significantly cooler, provided of course that the ambient air temperature is significantly lower than the temperature inside the laptop.
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