(1) (GB) (GigaByte) One billion bytes (technically 1,073,741,824 bytes). See giga and space/time.
(2) (Gb) (GigaBit) One billion bits (technically 1,073,741,824 bits). Lower case "b" for bit and "B" for byte are not always followed and often misprinted. Thus, Gb may refer to gigabyte. See GB/sec, giga and space/time.
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