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English word petabyte comes from English peta-, English byte
peta- (English)
In the International System of Units and other metric systems of units, multiplying the unit to which it is attached by 1015, a quadrillion. Symbol: P.
byte (English)
(computing) A sequence of adjacent bits (binary digits) that can be operated on as a unit by a computer; the smallest usable machine word; nearly always eight bits, which can represent an integer from 0 to 255 or a single character of text.. (computing) A unit of computing storage equal to eight bits.
petabyte (English)
(SI) One quadrillion (1015, or 1,000,000,000,000,000) bytes. SI symbol: PB.. (computing) 1,125,899,906,842,624 bytes or 10245, or 250. This capacity may be expressed unambiguously as a pebibyte. SI symbol: PiB, computing symbol: PB.