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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"). 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. Personal computers, the computer hardware familiar to most people, form only a small minority of computers (about 0.2%