What is a gigabyte (GB) and how is it measured? - TechTarget
https://www.techtarget.com/searchstorage/definition/gigabyte
WebA gigabyte (GB) -- pronounced with two hard Gs -- is a unit of data storage capacity that is roughly equivalent to 1 billion bytes. In decimal notation (base 10), a gigabyte is exactly 1 billion bytes. In binary notation (base 2), a gigabyte is equal to 2 30 bytes, or 1,073,741,824 bytes. Giga comes from a Greek word meaning giant.
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