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.

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