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plural gigabytes
(computing, formal) One billion (109, or 1,000,000,000) bytes or 1,000 megabytes. quotations examples
The IBM 3380 Direct Access Storage is a disk storage device with a storage capacity of 2.5 gigabytes (billion bytes) per unit, an increase of almost four times the capacity of the IBM 3350 Direct Access Storage.
1981, IBM 3380 Direct Access Storage Description and User's Guide, IBM, page 1
(computing, informal) a gibibyte. examples