You see a lot of crazy stuff built in Minecraft. With tens of millions of copies sold, the game has spawned a closet industry of builders, hackers and tinkerers. Minecraft communities have reconstructed the mines of Moria. They've placed a steampunk city atop a giant tortoise. Minecraft is even being used to teach.

The possibilities inside Minecraft seem endless.

One user, Cody Littley, went a step further recently. He made a hard drive inside Minecraft. Without any third-party crafting aides, he built one kilobyte of read-write storage.

He joined me for a guided tour.