Drive makers advertise decimal gigabytes while operating systems usually report binary gibibytes, so a 500 GB drive appears as about 466 GiB. Both definitions are listed separately here.
Convert bytes, kilobytes, megabytes, gigabytes and terabytes — in both decimal definitions (1,000 steps) and binary definitions (1,024 steps: KiB, MiB, GiB).
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Convert bytes, kilobytes, megabytes, gigabytes and terabytes — in both decimal definitions (1,000 steps) and binary definitions (1,024 steps: KiB, MiB, GiB).
📖 From the blog: Converting data storage units: MB, GB, TB and the 1,000 vs 1,024 trap
A DVD sold as 4.7 GB holds 4.7 billion bytes, which is 4.38 GiB in binary units. The gap between the two definitions grows with drive size.
Result = input × source-unit factor ÷ destination-unit factor. All factors are relative to the same base unit; intermediate values are not rounded. Decimal (SI) units step by 1,000 and binary (IEC) units step by 1,024; the two families are listed as separate units.
Bytes, Bits, kB (decimal), MB (decimal), GB (decimal), KiB (binary), MiB (binary), GiB (binary), TB (decimal), TiB (binary). Read the labels carefully: regional or decimal/binary variants are separate choices.
The maker counts a decimal terabyte (10^12 bytes) while your computer reports binary gibibytes (2^40 bytes) — and 10^12 divided by 2^40 is about 931. Nothing is missing.
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