A unit of computer memory or data storage capacity equal to 1,024 megabytes (230 bytes).
One billion bytes.
gigabyte 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)
[gig-uh-bahyt, jig-] 
əˌbaɪt
