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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.
The petabyte per second is a multiple of the unit bit for Data Transfer Rate. The prefix peta (symbol P) is defined in the International System of Units (SI) as a multiplier of 1.0 × 1015 (1 quadrillion, short scale), and therefore 1 petabyte per second = 1.0 × 1015 byte per second = 1000000000000000 byte per second. The petabyte per second has the unit symbol PB/s.