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The terabyte is a multiple of the unit byte digital information. the prefix tera means 10 in the international system of units (si), and therefore 1 terabyte is 1000000000000 bytes, or 1 trillion bytes, or 1000 gigabytes. 1 terabyte in binary prefixes is 0.9095 tebibytes, or 931.32 gibibytes. the unit symbol for the terabyte is tb or tbyte, but not tb (lower case b) which refers to terabit.