You'd have the Millenniata M-Disc, which is basically a 4.7GB DVD with a data layer made out of stone-like metals and metalloids. The idea is that conventional, ...

M-Discs are available in various storage capacities and aren’t all that expensive. You can get four M-Discs with 100 gigabytes of memory each for around $20 at Amazon, or a spindle of 100 25GB M ...