Data Storage Units (KB, MB, GB, TB)
Data storage units measure the size of digital information. A byte is 8 bits. In the decimal (SI) system used by drive makers, a kilobyte (KB) is 1,000 bytes, a megabyte (MB) is 1,000 KB, a gigabyte (GB) is 1,000 MB, and a terabyte (TB) is 1,000 GB. Operating systems sometimes use binary units based on 1,024.
GB vs. GiB
A gibibyte (GiB) is 1,024³ bytes, about 7.4% larger than a gigabyte, which is why a “1 TB” drive may show about 931 GB in some operating systems.
Bits vs. Bytes
Internet speeds are usually quoted in bits per second, storage in bytes.
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Last updated: September 29, 2026. This definition is for general educational purposes only. It is not financial, investment, tax, legal, or medical advice, and it does not recommend any product or course of action. For decisions about your own situation, consult a qualified professional.