Blu-Ray discs cannot hold 200GB data - more like 25GB for single layer, up to 50GB for dual layer.
Notice I wrote up to 200GB.
Maybe it will never happen. It depends on how many layers are eventually implemented. But i know I've seen some reference to a possible 200GB capacity. A Google search threw up the following, which was probably the source of that idea.
Sony will announce next month that it developed an 8-layer version of the Blu-ray Disc that is capable of storing 200GB of data, according to a company spokesperson. The announcement will be made at the International Symposium on Optical Memory 2004, which takes from October 11 to October 15, in Jeju Island, South Korea, according to Sony. The company further plans to commercialize a 4-layer 100GB version in 2007, says Sony spokesperson Taro Takamine.
"The advantage of Blu-ray over DVD is definitely capacity, and we are extending our multilayer performance. The 8-layer is a technology demonstration. We haven't decided when we are going to commercialize it yet," Takamine says.
The development is the fourth recent boost for the format as it competes with high-deifinition DVD to replace conventional DVDs in coming years. Both Sony and Matsu****a Electric Industrial, better known for its Panasonic brand, sell Blu-ray players.
But the players are expensive. A mass market will not develop for either of the new formats until major Hollywood studios are convinced that they can protect their content against piracy, according to analysts and industry watchers.