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It is in embedded systems in automobiles, microwave ovens, electrocardiograph machines, compact disc players, and other devices. 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. Discontinued versions include two generations of the iPod mini and four 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). As of July 2006, the lineup consists of the 5th generation iPod, with a video player; the iPod nano, with a color screen; and the iPod shuffle. Devices in the iPod family are designed around a central scroll wheel (except for the iPod shuffle) and provide a simple user interface. The iPod is currently the world's best-selling digital audio player, and its worldwide mainstream adoption makes