Given any method, memory diamond[1]. It's incredibly dense (25 grams of the stuff stores a bit over half a Yottabyte), and quite durable. If restricted to exist

Given any method, memory diamond[1]. It's incredibly dense (25 grams of the stuff stores a bit over half a Yottabyte), and quite durable. If restricted to existing methods ... a metric fuckton of hard drives in raid arrays, outsourcing backups to cloud storage providers where possible, and investing as much money as possible in getting a way to use memory diamond worked out. [1] Charles Stross describes it: "Memory diamond is quite simple: at any given position in the rigid carbon lattice, a carbon-12 followed by a carbon-13 means zero, and a carbon-13 followed by a carbon-12 means one. To rewrite a zero to a one, you swap the positions of the two atoms, and vice versa." See http://www.antipope.org/charlie/blog-static/2007/05/shaping_the_future.html http://www.antipope.org/charlie/blog-static/2007/05/shaping_...