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Firmware is a special type of software that rarely, if ever, needs to be changed and so is stored on hardware devices such as read-only memory (ROM) where it is not readily changed (and is therefore "firm" rather than just "soft"). 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. 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. Like many digital audio players, iPods can serve as external data storage devices when connected to a computer. 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. 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. Devices in the iPod family are designed around a central scroll wheel (except for the iPod photo). 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 bundled software used for uploading music, photos and videos to the iPod is called iTunes. As a music jukebox application, iTunes stores a comprehensive library of the user's music on their computer and can play, burn, and rip music from a CD. The full-sized model stores media on a built-in hard drive, while the smaller iPod nano and iPod shuffle use flash