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Computer hardware is the physical part of a computer, including the digital circuitry, as distinguished from the computer software that executes within the hardware. It is in embedded systems in automobiles, microwave ovens, electrocardiograph machines, compact disc players, and other devices. The iPod is a brand of portable media players designed and marketed by Apple Computer. The full-sized model stores media on a built-in hard drive, while the smaller iPod nano and iPod shuffle use flash memory. All three models were released in 2005. Personal computers, the computer hardware familiar to most people, form only a small minority of computers (about 0.2% of all new computers produced in 2003) Market statistics. Devices in the iPod family are designed around a central scroll wheel (except for the iPod photo). 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. Most computer hardware is not seen by normal users. Like many digital audio players, iPods can serve as external data storage devices when connected to