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The petabyte is a multiple of the unit byte for digital information. The prefix peta indicates the fifth power of 1000 and means 1015 in the International System of Units (SI), and therefore 1 petabyte is one quadrillion (short scale) bytes, or 1 billiard (long scale) bytes or 1000 terabyte, or 1 000 000 gigabytes . The unit symbol for the petabyte is PB.
The tebibit is a multiple of the bit, a unit of information, prefixed by the standards-based multiplier tebi (symbol Ti), a binary prefix meaning 240. The unit symbol of the tebibit is Tibit. 1 tebibit = 240 bits = 1099511627776 bits = 1024 gibibits.