Which statement correctly describes data unit prefixes used in networking and storage?

Which statement correctly describes data unit prefixes used in networking and storage?

• A. They denote powers of 1024
• B. They denote powers of 1000 in most contexts, but storage uses binary approximations (kibi, mebibyte, etc.)
• C. They denote color codes
• D. They denote time durations

Answer: (B)

Data unit prefixes come in two commonly used ways. In networking and data transfer, the prefixes kilo, mega, giga usually mean powers of 1000 (1 k = 1000, 1 M = 1,000,000, 1 G = 1,000,000,000, etc.). For storage, the historical practice used powers of 1024, which led to exact binary sizes like 1 KiB = 1024 bytes, 1 MiB = 1024^2 bytes, and so on. To make this distinction precise, the KiB, MiB, GiB prefixes were introduced for those binary sizes. The statement captures this real-world distinction: decimal (powers of 1000) in most contexts, but storage uses binary-based prefixes (KiB, MiB, etc.). It’s common to see drives marketed with decimal sizes (e.g., 1 TB = 10^12 bytes) while software reports binary-sized values (e.g., GiB), which can also add to the apparent difference.

Data unit prefixes come in two commonly used ways. In networking and data transfer, the prefixes kilo, mega, giga usually mean powers of 1000 (1 k = 1000, 1 M = 1,000,000, 1 G = 1,000,000,000, etc.). For storage, the historical practice used powers of 1024, which led to exact binary sizes like 1 KiB = 1024 bytes, 1 MiB = 1024^2 bytes, and so on. To make this distinction precise, the KiB, MiB, GiB prefixes were introduced for those binary sizes. The statement captures this real-world distinction: decimal (powers of 1000) in most contexts, but storage uses binary-based prefixes (KiB, MiB, etc.). It’s common to see drives marketed with decimal sizes (e.g., 1 TB = 10^12 bytes) while software reports binary-sized values (e.g., GiB), which can also add to the apparent difference.