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The bundled software used for uploading music, photos and videos to the iPod is called iTunes. The full-sized model stores media on a built-in hard drive, while the smaller iPod nano and iPod shuffle use flash memory. Devices in the iPod family are designed around a central scroll wheel (except for the iPod shuffle) and provide a simple user interface. Most computer hardware is not seen by normal users. 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. 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. Like many digital audio players, iPods can serve as external data storage devices when connected to a 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. The most recent version of iTunes has video organization features. 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. All three models