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Equivalents in other units

How much is 4,100 gigabytes?

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It's about as much as Watson.
(data store only)
Watson, the IBM supercomputer famous for competing against humans on the televised trivia game show Jeopardy!, utilizes 4,100 gigabytes of variously-structured data to formulate answers. While "thinking", Watson processes about 500 gigabytes of data per second.
It's about three-fifths as much as a Gap, Inc. Customer Database.
In other words, the amount of a Gap, Inc. Customer Database is 2 times 4,100 gigabytes.
(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 7,000 gigabytes 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 one-tenth as much as The's databases.
In other words, 4,100 gigabytes is 0.0946206 times the amount of The's databases, and the amount of The's databases is 10.5685 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 44,370.9 gigabytes of data. receives over 615 million visits to its US website each year.
It's about one-twentieth as much as The Google Earth database.
In other words, 4,100 gigabytes is 0.0568 times the amount of The Google Earth database, and the amount of The Google Earth database is 17.6 times that amount.
(2006 figures) (raw imagery and indexes storage)
As of 2006, Google was storing 72,200 gigabytes 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 one-twenty-fifth as much as The LHC Data Generated per Second.
In other words, the amount of The LHC Data Generated per Second is 30 times 4,100 gigabytes.
(a.k.a. Large Hadron Collider) (2008 figures)
Capturing millions of measurements per second on millions of subatomic particles, the Large Hadron Collider (LHC) at the European Organization for Nuclear Research (CERN) facility in Geneva generates 100,000 gigabytes of data every second. Data collection arrays are placed throughout the LHC's 8.6 km (5.3 mi) circular track.
It's about thirty times as much as an iPod.
In other words, 4,100 gigabytes is 25.6 times the amount of an iPod, and the amount of an iPod is 0.0391 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 160 gigabytes (gB). 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-thirtieth as much as The Hubble Telescope.
In other words, the amount of The Hubble Telescope is 31 times 4,100 gigabytes.
(a.k.a. Hubble Space Telescope, a.k.a. HST) (2008 figures)
Between its launch in 1990 and 2008, the Hubble Space Telescope gathered 120,000 gigabytes of images and other data about astronomical phenomena. Last upgraded during a service mission in 1999, the onboard computer of the Hubble Telescope has just 0.002 gigabytes of operating memory (RAM) — less than most smartphones.