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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). The iPod is a brand of portable media players designed and marketed by Apple Computer. The bundled software used for uploading music, photos and videos to the iPod is called iTunes. 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 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. It is in embedded systems in automobiles, microwave ovens, electrocardiograph machines, compact disc players, and other
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