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The megabyte per second is a multiple of the unit bit for Data Transfer Rate. The prefix mega (symbol M) is defined in the International System of Units (SI) as a multiplier of 1.0 × 106 (1 million, short scale), and therefore 1 megabyte per second = 1.0 × 106 byte per second = 1000000 byte per second. The megabyte per second has the unit symbol MB/s.
The mebibit per second is a multiple of the unit bit for Data Transfer Rate. The prefix mebi (symbol Mi) is defined in the International System of Units (SI) as a multiplier of 220, and therefore 1 mebibit per second = 220 bit per second = 1048576 bit per second. The mebibit per second has the unit symbol Mibit/s.