The first hard disk drives were created in the 1950s-1960s and were the size of a refrigerator  and had a capacity of a few megabytes. In 1982 the first IBM PC to have a hard disk, had a capacity of 5 megabytes . The first single hard disks of terabyte size did not appear until the late 2000s. In 2012, a 1 terabyte disk drive is 2.5 inches wide and fits inside a laptop computer.
In 1991, consumer grade, 1 gigabyte (1/1000 TB) disk drives were available for $2699 and up, and two years later prices for this capacity had dropped to $1499. By 1995, 1 GB drives could be purchased for $849.
2007 1 terabyte hard disk $370 ($417 adjusted for inflation)
2010 2 terabyte hard disk $200 ($214 adjusted for inflation)
2012 4 terabyte hard disk $450 (Hitachi, largest available in consumer market), 1 terabyte hard disk $100
2013 4 terabyte hard disk $179, 3 terabyte hard disk $129, 2 terabyte HD $100, 1 terabyte HD $80
Note: $ currency are in USD and not adjusted for inflation
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 "[a]s of May 2013, the Library has collected about 422 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".
Usenet messages – In October 2000, the Deja News Usenet archive had stored over 500 million Usenet messages which used 1.5 TB of storage.
Encyclopedia – Wikipedia's January 2010 raw data uses a 5.87 terabyte dump.
Climate science – In 2010, the German Climate Computing Centre (DKRZ) was generating 10,000 TB of data per year, from a supercomputer with a 20 TB memory and 7,000 TB disk space.
Audio – One terabyte of audio recorded at CD quality will contain around 2,000 hours of audio. Additionally, one terabyte of compressed audio recorded at 128 kB/s will contain about 17,000 hours of audio.
^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."