Thirteen years ago, new PCs came with bulky, heavy 500MB hard drives inside. They were state of the art, and you could install the likes of Doom II and Duke Nukem 3D many times over. In 2008, things have moved on substantially. And we are now faced with a portable, external 2.5-inch hard drive from Buffalo, which has a capacity of half a terabyte. That's 500GB, 1000 times more than the internal drives of 13 years past.