ABSTRACT
Computer systems use a variety of technologies to store and transmit data. Processor and memory chips are based on semiconductor technology; disks are made from magnetic materials spread over the surface of a thin, circular plate; removable disks have a reflective surface with tiny pockmarks that are detected by lasers; digital cameras and cell phones store digital information in “flash” memories that retain their data even when the device is turned off; networks transfer information in the form of light waves over fiber-optic cables.
