Very Small.
This article is about magnetic storage. If you are not stunned by the fact that an Ipod can store +/-5000 songs, then this will not mean much to you.
"Until now, the most advanced magnetic storage systems have needed about one million atoms to store a digital 1 or 0. The new achievement is the product of a heated international race between elite physics laboratories to explore the properties of magnetic materials at a far smaller scale.
Researchers at I.B.M. have stored and retrieved digital 1s and 0s from an array of just 12 atoms, pushing the boundaries of the magnetic storage of information to the edge of what is possible."
Later today I will be racking leaves and my wife will ask me, "Honey, what are you mumbling about?" When I answer," Atomic level magnetic storage", she will think I am being sarcastic.
http://www.nytimes.com/2012/01/13/science/smaller-magnetic-materials-push-boundaries-of-nanotechnology.html?_r=1
