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How much is 2 terabytes?

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It's about half as much as Watson
In other words, 2 terabytes is 0.5 times the amount of Watson, and the amount of Watson is 2 times that amount.
(data store only)
Watson, the IBM supercomputer famous for competing against humans on the televised trivia game show Jeopardy!, utilizes 4 terabytes of variously-structured data to formulate answers. While "thinking", Watson processes about 0.490 terabytes of data per second.
It's about three-tenths as much as a Gap, Inc. Customer Database
In other words, 2 terabytes is 0.3 times the amount of a Gap, Inc. Customer Database, and the amount of a Gap, Inc. Customer Database is 3 times that amount.
(a.k.a. The GAP Companies, a.k.a. Gap) (2012 figures)
The GAP Inc., the corporate parent of GAP store, Old Navy, and Banana Republic, has accumulated over 7 terabytes of data on almost a billion customers. The GAP, Inc remains the largest apparel retailer in the United States and was the largest in the world from the mid-1990s until about 2008.
It's about thirteen times as much as an iPod
In other words, 2 terabytes is 12.8 times the amount of an iPod, and the amount of an iPod is 0.078 times that amount.
(a.k.a. Apple iPod) (2010 figures; for iPod classic, sixth generation)
A sixth-generation, iPod classic MP3 player offers a storage capacity of 0.1560 terabytes. Data is stored in the unit's hard drive, a 5,400 RPM SATA drive, which measures about 30 sq. cm (5 sq. in)
It's about one-twentieth as much as The's databases
In other words, 2 terabytes is 0.047264 times the amount of The's databases, and the amount of The's databases is 21.1577 times that amount.
(largest databases only; 2005 figures) maintains information on the millions of items sold on it's e-Commerce website and the websites of its affiliate companies, as well as information on customer orders and browsing history, and excerpts from nearly a quarter-billion books in databases totaling an estimated 43.331 terabytes (tB) of data. receives over 615 million visits to its US website each year.
It's about one-thirty-fifth as much as The Google Earth database
In other words, 2 terabytes is 0.028 times the amount of The Google Earth database, and the amount of The Google Earth database is 35.2 times that amount.
(2006 figures) (raw imagery and indexes storage)
As of 2006, Google was storing 70.5 terabytes (tB) of raw image and index data for its satellite photo and virtual globe application, Google Earth. The application offers high resolution satellite imagery of 60% of the populated areas of the world, according to 2010 estimates.
It's about forty times as much as Wikipedia
In other words, 2 terabytes is 39 times the amount of Wikipedia, and the amount of Wikipedia is 0.03 times that amount.
(2009 figures) (all languages)
As of 2009, Wikipedia held 0.052 terabytes of publicly written and edited encyclopedia articles on 14.5 million subjects as well as associated commentary and discussion. Wikipedia is among the ten most popular websites on the Internet and the only non-profit entity in that group.
It's about 40 times as much as a Blu-ray Disc
In other words, 2 terabytes is 41 times the amount of a Blu-ray Disc, and the amount of a Blu-ray Disc is 0.02 times that amount.
(a.k.a. BD) (dual-layer; Blu-ray disc)
A typical Blu-ray disc will hold 0.049 terabytes of data. The increase in capacity versus a standard DVD is possible because of the smaller wavelength of blue light — 405 nanometers instead of 650 nanometers for the red laser light used in a DVD.