Each file is comprised of three layers of nanoscale dots. The dots' size and orientations, as well as their position within the three standard dimensions, constitute its five dimensions. These dots change the polarization of light travelling through the disc which is read using a microscope and polarizer.
The Southampton team originally demonstrated the technology back in 2013 though, at that point, they could only fit a 300kb test file onto a disc. In the three years since their first demonstration, they've essentially perfected the recording technique and have since recorded the entirety of the Universal Declaration of Human Rights (UDHR), Newton's Opticks, Magna Carta and Kings James Bible.
"It is thrilling to think that we have created the technology to preserve documents and information and store it in space for future generations," Professor Peter Kazansky from the ORC said in a statement. "This technology can secure the last evidence of our civilisation: all we've learnt will not be forgotten."