The first hard disk drives were created in the 1950s and 1960s and had the size of a refrigerator, and had a capacity of a few megabytes. In 1982, the first IBM PC with a hard disk drive, had a capacity of 5 megabytes. The first single hard disks of terabyte size did not appear until the late 2000s. As of 2014, 1 terabyte solid state drives use an mSATA form factor.
2013: First 6 terabyte drive (HGST Western Digital), filled with helium
In 1991, consumer grade, 1 gigabyte (1/1000 TB) disk drives were available for US$2699 and more, and two years later prices for this capacity had dropped to US$1499. By 1995, 1 GB drives could be purchased for US$849.
2007: 1 terabyte hard disk costs US$370
2010: 2 terabyte hard disk costs US$200
2012: 4 terabyte hard disk US$450 (Hitachi, largest available in consumer market), 1 terabyte hard disk US$100
2013: 4 terabyte hard disk US$179, 3 terabyte hard disk $129, 2 terabyte hard disk $100, 1 terabyte hard disk US$80
2013: 4 terabyte hard disk US$150, 3 terabyte hard disk $129, 2 terabyte hard disk $90, 1 terabyte hard disk US$60
Illustrative usage examples
Examples of the use of terabyte to describe data sizes in different fields are:
Library data: The U.S. Library of Congress Web Capture team claims that "as of March 2014, the Library has collected about 525 terabytes of web archive data" and that it adds about 5 terabytes per month.
Online databases: Ancestry.com claims approximately 600 TB of genealogical data with the inclusion of US Census data from 1790 to 1930.
Computer hardware: Hitachi introduced the world's first one terabyte hard disk drive in 2007.
Historical Internet traffic: In 1993, total Internet traffic amounted to approximately 100 TB for the year. As of June 2008[update], Cisco Systems estimated Internet traffic at 160 TB/s (which, assuming to be statistically constant, comes to 5 zettabytes for the year). In other words, the amount of Internet traffic per second in 2008 exceeded all of the Internet traffic in 1993.
Social networks: As of May 2009, Yahoo! Groups had "40 terabytes of data to index".
^IRENE THAM (2009-04-08). "Taking a monster shit; Massive computer power was needed to create the 3-D movie Monsters Vs Aliens.". The Straits Times. "The 3-D movie used up close to 100 terabytes of disk space and more than 40 million hours of rendering."