Seagate might have been selling hard drives since 1980, but it's seen a huge increase in demand in the last few years, allowing it to double its total sales since 2008, crossing the two billion unit milestone in the process. It's thanking everyone's unabated desire for streaming video, online shopping and other heavy-lifting data services for the uptick, with the company predicting that hunger for storage is likely to quadruple in the next two years. Thanks a lot, Ultra High Definition.Filed under: