PaperDisk
From Just Solve the File Format Problem
PaperDisk is a scheme to store data in patterns of dots printed on paper. One megabyte can be stored on an 8 1/2" x 11" sheet. Presumably there is some sort of filesystem like on a floppy disk, but technical details are rather sketchy online.
This is not to be confused with the "paper disc" described in this Wikipedia article, which is a form of BluRay disc composed of paper that was developed by Sony and Toppan Printing.
