It's about 650,000,000 times as much as The Google Earth database.
In other words, the amount of The Google Earth database is 0.000000001560 times 42 zettabytes.(2006 figures) (raw imagery and indexes storage)
As of 2006, Google was storing 0.00000006570 zettabytes 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 1,000,000,000 times as much as The Amazon.com's databases.
In other words, 42 zettabytes is 1,065,740,000 times the amount of The Amazon.com's databases, and the amount of The Amazon.com's databases is 0.0000000009383150 times that amount.(largest databases only; 2005 figures)
Amazon.com 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 0.00000004035510 zettabytes of data. Amazon.com receives over 615 million visits to its US website each year.
It's about 7,000,000,000 times as much as a Gap, Inc. Customer Database.
In other words, the amount of a Gap, Inc. Customer Database is 0.0000000001000 times 42 zettabytes.(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 0.00000000700 zettabytes 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 10,000,000,000 times as much as Watson.
In other words, 42 zettabytes is 11,000,000,000 times the amount of Watson, and the amount of Watson is 0.0000000000910 times that amount.(data store only)
Watson, the IBM supercomputer famous for competing against humans on the televised trivia game show Jeopardy!, utilizes 0.00000000370 zettabytes of variously-structured data to formulate answers. While "thinking", Watson processes about 0.000000000450 zettabytes of data per second.
It's about 300,000,000,000 times as much as an iPod.
In other words, 42 zettabytes is 288,000,000,000 times the amount of an iPod, and the amount of an iPod is 0.000000000003470 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 0.0000000001460 zettabytes. 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 900,000,000,000 times as much as Wikipedia.
In other words, 42 zettabytes is 880,000,000,000 times the amount of Wikipedia, and the amount of Wikipedia is 0.00000000000110 times that amount.(2009 figures) (all languages)
As of 2009, Wikipedia held 0.0000000000480 zettabytes 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 950,000,000,000 times as much as a Blu-ray Disc.
In other words, the amount of a Blu-ray Disc is 0.00000000000110 times 42 zettabytes.(a.k.a. BD) (dual-layer; Blu-ray disc)
A typical Blu-ray disc will hold 0.0000000000450 zettabytes 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.