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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 yobibit per second is a multiple of the unit bit for Data Transfer Rate. The prefix yobi (symbol Yi) is defined in the International System of Units (SI) as a multiplier of 280, and therefore 1 yobibit per second = 1080 bit per second = 1208925819614629174706176 bit per second. The yobibit per second has the unit symbol Yibit/s.