Non-Magnetic Data Storage: Principles, Potential, and Problems

To complement and possibly replace conventional magnetic data storage, alternative data storage concepts are being explored. Examples are probe-tip-based storage schemes with atomic resolution or a variety of volumetric optical data storage such as holographic data storage. These techniques boast high storage densities, fast access times, and high data rates. Underlying principles and the status of these data storage schemes will be reviewed and the open issues will be discussed.