Imagine a CD with a storage capacity not of 650 MB but 650 million MB. Such a storage capacity is theoretically possible because of experiments using individual atoms to store data.
But don’t expect it soon, the gap between theory and practice is wide.

In 1959 physicist Richard Feynman pointed out that all the words written in the history of the world could be contained in a cube of material one tenth of a millimetre wide – provided those words were written with atoms.

Now scientists have done just that, creating an atomic-scale memory by using atoms of silicon in place of the 1s and 0s that computers use to store data. More here.