Since Sony has defined the Blu-ray Disc spec as to being 54Gig max on a dual-layer disc, there's been speculation, theorization, and discussion of an 8-layer 200GB disc. Sony even supposedly had some working 200GB BRD demos way back in 2004. Well, over at TDK, who apparently hope to commercialize, the first presumably quad-layered dual-sided discs (or possibly octo-layered single-sided discs) are now in the works. They're not giving it up as to when these discs could come out or how much they'll cost, or even if there's something to play them with.