It seems that the documents and presentations you have stored on your memory stick could possibly be maintained for a billion years without degrading, according to initial reports of soon to be published research.
Prof. Alex Zettl in the Department of Physics at U.C. Berkeley and in the Materials Sciences Division of Lawrence Berkeley National Laboratory conducted the research.
The research describes the use of an iron nanoparticle contained within a carbon nanotube in which when in the presence of electricity the nanoparticle slides back and forth along the nanotube. This serves as a memory device that can store digital information and play it back on computer hardware.
While no timetable is provided for when this technology could possibly make it into commercial products, it is likely some time off. And as recent evidence has shown, the obstacles will not just be technical ones.