About five years ago, I wrote a piece for the now-defunct Business 2.0 about storage technologies and how we’d have terabytes on our iPods. Well, our iPods are not that fat but our drives are getting fatter for sure. Seagate today announced what it’s calling the world’s first 3-terabyte external desktop drive (dubbed FreeAgent GoFlex), which costs about $250. First of all, that is a massive amount of storage capacity — and it’s cheap. Atwo years ago paid more than $1,500 to build a 2-terabyte networked storage system using BuffaloTech LinkStation and Apple Time Capsule. And here we are getting a disk for so cheap. Seagate thinks that an increase in HD movie downloads will push people into buying bigger drives. It can fit up to 120 HD movies.