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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 yottabyte per second is a multiple of the unit bit for Data Transfer Rate. The prefix yotta (symbol Y) is defined in the International System of Units (SI) as a multiplier of 1.0 × 1024 (1 septillion, short scale), and therefore 1 yottabyte per second = 1.0 × 1024 byte per second = 1000000000000000000000000 byte per second. The yottabyte per second has the unit symbol YB/s.