6. Terabyte

Commonly written as TB.

A terabyte is equivalent to 1024 Gigabytes although you will commonly see it referred to as 1,000 Gigabytes (which isn't correct).

A terabyte is also equivalent to just over one million megabytes.

To put it in some perspective, a Terabyte could hold about 3.6 million x 300 Kilobyte images or maybe about 300 hours of good quality video. A Terabyte could hold 1,000 copies of the Encyclopedia Britannica.

For the time being, hard disks measured in terabytes are more than ample for anything that you might want to do at home, school or work although it is useful as a backup device that can store the data from several computers or a network.

However, waiting just around the corner is the next level up in storage capacity, the petabyte - 1024 terabytes!