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The gigabit per second is a multiple of the unit bit for Data Transfer Rate. The prefix giga (symbol G) is defined in the International System of Units (SI) as a multiplier of 1.0 × 109 (1 billion, short scale), and therefore 1 gigabit per second = 1.0 × 109 bit per second = 1000000000 bit per second. The gigabit per second has the unit symbol Gbit/s.
The kibibyte is a the unit of data transfer rate. The binary prefix kibi means 210, or 1024; therefore, 1 kibibyte per second is 1024 bytes per second. The unit symbol for the kibibyte per second is KiB / s.