A gigabyte (GB) is a measure of computer data storage capacity and it is “approximately” a million bytes. A gigabyte is 1, or two towards the 30th energy,073, 741 in decimal notation.The word is pronounced with two hard Gs. The prefix, “giga” originates from a Greek word meaning “giant.”
To address this ambiguity, the International System of Quantities standardizes the binary prefixes which denote a series of integer powers of 1024. With these prefixes, a memory module that is labeled as having the size 1GB has one gibibyte (1GiB) of storage capacity.
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The hard disk was invented on September 13, 1956 by IBM team led by Rey Johnson (considered as “father” of the disk drive). Earlier hard disk drives were large and cumbersome devices.