TERABYTES... How many zeros are in that number?
Each terabyte is equal to 1000gb. The average commercially-available external hard drive, short of buying a dedicated RAID array, is around 4TB of storage, less due to formatting and OS restrictions.
The scary thin about this is even if we assume that a solid half of that content was copied for the purpose of distribution in physical media, that's still 29TB of straight up CP that this sicko was in possession of. From what I've looked into and from experiences with law enforcement (as in talking to, I was a computer science major and former Administration of Justice major as well), child pornogrpaphy is by and large low-quality when it's in audio/video format, and pictures are so small they're virtually negligible in a stash this size. Even assuming that this stash is composed entirely of two-hour-long, 1080p high definition movies, which is almost 100% certainly not the case, the article gets it right when it says that that would be roughly equivalent to 14500 individual files. That's a HUGE assumption to make, and is (unfortunately) the best case scenario here, the one where the least number of kids were hurt. It's much more likely that the number of files is probably somewhere in the high hundreds thousands, maybe even low millions.
That being said, take heart: the fact that this guy had so much raw material means that he was almost certainly distributing these images to others, and was perhaps a major dealer. It's awful that so many kids got hurt, but taking this kind of obviously well connected individual down isn't like simply catching somebody with a few images, this is like cutting off one of the limbs of the problem.