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Most computer hardware is not seen by normal users. Discontinued versions include two generations of the iPod mini and four generations of the iPod mini and four generations of the full-sized iPod, all of which had monochrome screens (except for the iPod photo). It is in embedded systems in automobiles, microwave ovens, electrocardiograph machines, compact disc players, and other devices. Computer hardware is the physical part of a computer, including the digital circuitry, as distinguished from the computer software that executes within the hardware. The hardware of a computer is infrequently changed, in comparison with software and data, which are "soft" in the sense that they are readily created, modified or erased on the computer. The iPod is currently the world's best-selling digital audio player, and its worldwide mainstream adoption makes it one of the most popular consumer brands. Like many digital audio players, iPods can serve as external data storage devices when connected to a computer. Devices in the iPod family are designed around a central scroll wheel (except.