Information Week posted a system building guide, focusing on assembling a PC with a total storage capacity of nearly 1TB. Actually it's not that hard, you just need two 500GB HDDs.
Why near-terabyte? Well, as anyone who's been in the business a while knows, hard-drive manufacturers persist in calling every 1,000 bytes a kilobyte, even though a real kilobyte is 1024 bytes. For the sake of an example, imagine a disk maker builds a platter that stores 1 million bytes; the company would no doubt market this product as a 1 MB drive, even though the drive technically falls short of a megabyte by some 24,000 bytes. Back in the real world, this means our "terabyte" configuration actually clocks in at about 930 GB. A whopping 70 GB are lost to marketing!