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The gibibyte per second is a multiple of the unit bit for Data Transfer Rate. The prefix gibi (symbol Gi) is defined in the International System of Units (SI) as a multiplier of 8 × 230, and therefore 1 gibibyte per second = 8 × 230 byte per second = 1073741824 byte per second. The gibibyte per second has the unit symbol GiB/s.
The kilobyte per second is a the unit bit for data transfer rate. The prefix kilo- (symbol k) is defined in the International System of Units (SI) as a multiplier of 103 (1 thousand), and therefore, 1 kilobyte / s = 8 kilobits / s = 8000 bits / s.