Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you have been placed in read-only mode.
Please download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript).
@PJ_Evans @cstross doing a 1 for 1 swap with quad layer BD-R discs boosts the capacity to 12,800 GB, but that is a write once technology.