We’ve mentioned the tremendous growth of Facebook at numerous occasions on this blog, and it’s fascinating how fast the social network has risen from being an upstart fighting with MySpace to basically leaving the entire social media landscape behind in the dust.

Since Facebook is now so ginormous (that’s the scientific term for it, right?) we wanted to give you a frame of reference for how big the service has become. And as we so often do, we’ve done it with a chart.

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It took 51 years before hard disk drives reached the size of 1 TB (terabyte, i.e. 1,000 GB). This happened in 2007. In 2009, the first hard drive with 2 TB of storage arrived. So while it took 51 years to reach the first terabyte, it took just two years to reach the second.

This article looks back at how hard disk drives have evolved since they first burst onto the scene in 1956. We’ll examine the radical changes over time for three different aspects of HDDs: Size, storage space, and price.

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