Binary (1024) โ KiB, MiB, GiB
Decimal (1000) โ KB, MB, GB
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๐ก Why two systems? Binary (1024-based) is how operating systems calculate file sizes โ what you see in Windows/Mac file properties. Decimal (1000-based) is how storage manufacturers advertise capacity (e.g. a "1TB" drive). This is why a "1TB" drive shows as ~931GB in your operating system.