Non-rewriteable media seems more likely to preserve information for a long time, as people can't reuse the media to store new information. For example, printing on paper or other materials, (modulo bleaching like with the Archimedes palimpsest), CD-ROM, DVD-ROM.
Modify magnetic and solid state storage devices so that they cannot be overwritten. This is probably easiest done with a hardware embedded interlock. Maybe a cryptographic key can unlock it back to read-write mode. This should be fairly easy as these devices have sophisticated hardware in them already.
Inspired by a "Little Library" of a few books someone put in front of their house. People are encouraged to borrow and leave books by the honor system. The honor system works because there isn't much value in stealing a book and (say) attempting to sell the used book. This could also be done with CD-ROMs, but it could not be done with, say, flash drives, because people would just steal them and overwrite the data.
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