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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.
The gigabyte 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 gigabyte per second = 1.0 × 109 byte per second = 1000000000 byte per second. The gigabyte per second has the unit symbol GB/s.