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That’s right … Gibibytes (GiB), not Gigabytes (GB).
Back when I was at school a Megabyte (MB) was 1,024 Kilobytes (KB) or 1,048,576 Bytes. Well nowadays hardware manufacturers have a different IEEE take on what a Gigabyte is. For users like you and me, a Gigabyte is 1,073,741,824 (1024^3) bytes but for the manufacturer it’s 1,000,000,000 [...]