5 exercises on pronouncing binary and decimal size prefixes aloud.
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How is the binary prefix "kibi-" (as in kibibyte, KiB) pronounced?
The binary prefix kibi- is pronounced "KIB-ee" /ˈkɪbiː/ — first syllable "kib" (short /ɪ/, rhyming with "rib"), then "ee." So "a kibibyte" is "a KIB-ee-byte" (1024 bytes), abbreviated KiB. It was coined (by the IEC) from "kilo binary." Do not say "KY-bye" or stress the second syllable. The pattern repeats: mebi-, gibi-, tebi- all start with the same short-vowel + "bee" structure.
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How is "mebi-" (as in mebibyte, MiB) pronounced?
The binary prefix mebi- is pronounced "MEB-ee" /ˈmɛbiː/ — "meb" (short /ɛ/ as in "web") plus "ee." So "a mebibyte" (MiB) is 1024 kibibytes = 1,048,576 bytes. It comes from "mega binary." Do not say "MEE-bye." It parallels its decimal cousin "mega-" but uses the distinct "MEB-ee" form to signal a power of 1024 rather than 1000.
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How is "gibi-" (as in gibibyte, GiB) pronounced?
The binary prefix gibi- is pronounced "GIB-ee" /ˈɡɪbiː/ — with a hard g /ɡ/ (as in "go"), "gib" (rhyming with "rib"), plus "ee." So "a gibibyte" (GiB) is 1024 mebibytes. From "giga binary." Do not use a soft "j" sound ("JIB-ee") and do not say "GUY-bye." The g stays hard, matching the hard g many people use in "giga-." It denotes a power of 1024 (2^30 bytes).
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How is the decimal prefix "tera-" (as in terabyte, TB) pronounced?
The prefix tera- is pronounced "TAIR-uh" /ˈtɛrə/ (also "TERR-uh") — two syllables, stress on the first, short /ɛ/ vowel. So "a terabyte" is "a TAIR-uh-byte" (10^12 bytes, or 2^40 in loose usage). Do not say "TEE-ra" with a long "ee" or stress the second syllable. It comes from the Greek for "monster." The first syllable rhymes with "air"/"hair," not "tee."
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How is "giga-" (as in gigabyte, GB) most standardly pronounced?
The prefix giga- is most commonly pronounced "GIG-uh" /ˈɡɪɡə/ — hard g, short /ɪ/ vowel, stress on the first syllable. So "a gigabyte" is "a GIG-uh-byte" (10^9 bytes). A soft-g variant "JIG-uh" /ˈdʒɪɡə/ also exists and is accepted (the dictionary lists both), but the hard-g "GIG-uh" dominates in tech speech. Do not say "GUY-guh" with a long "i." Stress is on the first syllable either way.