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A terabyte (TB) is a unit of digital information storage used to denote the size of data. It is equivalent to 1,000 gigabytes, or 1,000,000,000,000 bytes, using the SI standard.
The prefix "tera" of terabyte is part of the SI or International System of Units, and means 1012. Hard disk manufacturers label their products in SI, which may confuse some people in the IT field. The ISO, IEEE and the IEC all recommend using the unit tebibyte, which is more accurate for the measure of bytes signifying 1,0244 bytes.
Two interpretations can be made using the two standards: