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All three models were released in 2005. 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 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 shuffle) and provide a simple user interface. Most computer hardware is not seen by normal users. 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 full-sized model stores media on a built-in hard drive, while the smaller iPod nano and iPod shuffle use flash memory. It is in embedded systems in automobiles, microwave ovens, electrocardiograph machines, compact disc players, and other devices..