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The terabyte is a multiple of the unit byte for digital information. The prefix tera represents the fourth power of 1000, and means 1012 in the International System of Units (SI), and therefore one terabyte is one trillion (short scale) bytes, 1000 gigabytes, 1000 000 megabytes. The unit symbol for the terabyte is TB.
The megabit is a multiple of the unit bit for digital information. The prefix mega (symbol M) is defined in the International System of Units (SI) as a multiplier of 106 (1 million), and therefore 1 megabit = 106bits = 1 000 000 bits = 1000 kilobits.
The megabit has the unit symbol Mb or Mbit.