Stored Data Doubles in Three Years
If you're feeling overwhelmed by information overload lately, you may not be alone. The amount of new information stored on various media such as hard drives has doubled in the past three years, to five exabytes of new information produced in 2002, according to a recent study by the University of California at Berkeley.
That's exabytes, as in one byte with 18 zeros behind it, six zeros more than a terabyte. The amount of information put into storage in 2002, five exabytes, is equal to the contents of a half a million new libraries, each containing a digitized version of the print collection of the entire U.S. Library of Congress, according to the study. It was headed by professors Peter Lyman and Hal Varian of the UC Berkeley School of Information Management and Systems. The professors estimate between two and three exabytes of information was generated in 1999.
Most of that data--92 percent of it--was stored on magnetic media, primarily hard drives, the study estimates.
The study, a follow-up to a 2000 study by UC Berkeley, doesn't dwell on how people and companies process these massive amounts of information coming at them, Lyman says. His next project is a study examining that very issue. "I'm going to spend the next year on the consumption of information," he says. "How do people make sense of this? How do they cope?"
The current study also doesn't address the quality of information and how people choose good information sources, he adds. Significant differences exist in the "accessibility and usability and trustworthiness" of information between various sources, Lyman nots. "We treated it all the same, simply to understand how much there was ... but when you get into consumption, the discrimination over the quality of information, and how you make that decision, really becomes important," he adds.
With the amount of stored information growing at a rate of about 30 yearly, a "real change in our human ecology" is taking place, Lyman says. He presented the study at a conference in Florida this week. "Everything is public," he says of the massive data storage.
One problem with all this information being stored is that it's not always accurate, he adds. As information passes through multiple hands, it can be condensed or mischaracterized. For example, commentaries or reports on a speech or a paper Lyman gave 20 years ago sometimes contain distortions, he says.
"There are multiple renditions, only one of which I remember," he adds.
Above and Beyond
The study underscores the need for companies to smartly manage their information, says Gil Press, director of corporation information at EMC, an information storage vendor and a sponsor of the study. But IT solutions aren't the only answer, because humans still need to look at information with a critical eye, he adds.
"We are getting swamped, and we need better ways to organize and manage information," Press says. "Hopefully, information technology will never replace smart thinking and the human analytical thinking."
The amount of stored information doesn't count everything. Electronic channels--including TV, radio, the telephone, and the Internet--produced three and a half times as much information as was stored in 2002. Most of that information was exchanged through voice telephone calls and not recorded or stored, Lyman says. The telephone accounts for the largest percentage of information flow--17.3 exabytes if stored in digital form--followed by e-mail, which generates about 400,000 terabytes of new information each year, the study's authors say.
The researchers estimated that the World Wide Web contains 172 terabytes of information on public pages.
The researchers used various methods to estimate the amount of information generated and stored, including statistics such as hard drive and paper sales, publication statistics, and a sampling of the Web.
One surprise for Lyman was that while digital storage continues to grow, the use of paper to transmit information is not shrinking.
His team estimates the number of terabytes of information put on paper each year increased by 36 percent from 1999 to 2001. The amount of data stored magnetically each year increased by 80 percent between 1999 and 2002.
North Americans each consume 11,916 sheets of paper each year, while residents of the European Union consume 7280 sheets, the team estimates. The majority of that paper information is produced by office documents and mail, not in formally published titles such as books or newspapers.