1982, from giga- + byte.
A unit of computer memory or data storage capacity equal to 1,024 megabytes (230 bytes).
One billion bytes. See Note at megabyte.
unit 2^30 = 1,073,741,824 bytes = 1024 megabytes. Roughly the amount of data required to encode a human gene sequence (including all the redundant codons). See prefix. (1995-09-29)