A terabyte is a measure of digital information that is equal to one trillion bytes or one thousand gigabytes. A single terabyte can store about 300 hours of good quality video or 3.6 million 300 kilobyte images. It is succeeded by the petabyte unit of measurement and terabyte is usually abbreviated as TB.
Its prefix, tera, comes from a Greek word that translates to monster. Terabytes have become the standard measure of storage capacity for big storage devices. A typical personal computer hard disk can hold up to 2 TB of data. Specialized high-end work stations and servers may have a total capacity of more than 10 TB.