Martin P. answered 11/12/17
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A gigabyte (GB) is a measure of computer data storage capacity that is roughly equivalent to 1 billion bytes. A gigabyte is two to the 30th power or 1,073,741,824 in decimal notation. The term is pronounced with two hard Gs.
1,073,741,824 [bytes] / 875,000 [bytes / minute] = 1,227.13 minutes