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The zettabyte per second is a multiple of the unit bit for Data Transfer Rate. The prefix zetta (symbol Z) is defined in the International System of Units (SI) as a multiplier of 1.0 × 1021 (1 sextillion, short scale), and therefore 1 zettabyte per second = 1.0 × 1021 byte per second = 1000000000000000000000 byte per second. The zettabyte per second has the unit symbol ZB/s.
The kibibit per second is a unit of data transfer rate, using the standard binary prefix kibi, which has the symbol Ki, meaning 210. The unit symbol of the kibibit per second is Kibit / s. 1 kibibit / s = 210 bits / s = 1,024 bits / s.