Well, I was reading "The Economist" (a magazine) and there was an article about a new type of disc format. Its called holograhic storage (still discs like DVDs and stuff tho). The first ones will be able to store 300GB of data - "12 times more than the latest Blu-ray disvs and 60 times more than a standard DVD. And within a few years this capacity is expected to increase more than fivefold to 1.6 terabytes (1,600 GB)."
The example of what 1.6 terabytes can store (taken from the article) was 5 seasons of a television drama, in high defintion, on one disc. So the Sopranos, which is ten seasons, could fit on two discs instead of (4 discs in season 1, say they all have 4 discs, so thats 40 DVDS!) 40 DVDS!

Imagine the length of a game that took up all that space.....