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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 mebibyte 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 8 × 220, and therefore 1 mebibyte per second = 8 × 220 byte per second = 1048576 byte per second. The mebibyte per second has the unit symbol MiB/s.