As recently as a few weeks ago, TDK had announced plans for a 200GB Blu-Ray disc. Many thought this to be a digital media storage impossibility. Well, TDK has pulled it off in a most unique way.
TDK had tried to cram 50GB on each Blu-Ray Disc layer (2 layers per side, 4 in total) but it couldn't be done. The they tried to add more layers, and viola. A conventional Blu-Ray Disc will hold about 25GB per layer. So, two sides per layer and two sides equals 100GB. Further storage can be achieved by muxing, aka multiplexing multiple signals together. It's like writing fours books in one. You have one book, but four different types of text on the page. Each type of text represents a different book, you just have to choose what book you want to read and pay attention to that text and that text alone.
they should fix it's speed problem