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The megabyte is a multiple of the unit byte for digital information. Its recommended unit symbol is MB. The unit prefix mega is a multiplier of 1000000 (106) in the International System of Units (SI).
A terabit is a multiple of the unit bit for digital information or computer storage. The prefix tera (symbol T) is defined in the International System of Units (SI) as a multiplier of 1012 (1 trillion, short scale), and therefore 1 terabit = 1012bits = 1 000 000 000 000 bits = 1000 gigabits.
The terabit has the unit symbol Tbit or Tb.