5 exercises on saying data and storage units aloud — bits vs bytes, sub-second times, binary prefixes, and bus widths.
Key patterns
Mbps — "megabits per second"; MBps — "megabytes per second" (8x bigger)
ms / µs / ns — milli / micro ("MY-kro") / nano-seconds
KB vs KiB — kilobyte (1000) vs kibibyte (1024)
64-bit — "sixty-four bit" (bit, not byte)
Gigabit vs Gigabyte — the "-byte" form is 8x the "-bit" form
0 / 5 completed
1 / 5
A colleague writes that a download link is 10 Mbps. How should this be read aloud, and what does it measure?
Mbps = "megabits per second" — a network-speed unit:
The lower-case b means bits; an upper-case B means bytes. This single letter changes the meaning by a factor of 8.
Mbps / Mb/s — "megabits per second" — used for link/bandwidth speeds (broadband is sold in megabits).
MBps / MB/s — "megabytes per second" — used for actual data transfer/throughput (file copy speed).
The 8x trap: a "100 megabits per second" connection delivers at most ~12.5 megabytes per second, because 1 byte = 8 bits.
Read them clearly:
Kbps → "kilobits per second"
Gbps → "gigabits per second" (a "ten gig" link informally)
Never blur "bit" and "byte" — in a capacity-planning conversation the difference is enormous.
2 / 5
You see 500 µs in a latency trace. How is the unit "µs" pronounced?
µs = microseconds — "MY-kro-seconds":
The symbol µ is the Greek letter mu, used as the SI prefix micro- (one millionth). So 500 µs is "five hundred microseconds".
µs → "microseconds" — one millionth of a second (10-6 s).
Pronounce micro as "MY-kro", not "mee-kro" or "mew".
Do not confuse the sub-second units:
ms → "milliseconds" — thousandth (10-3 s)
µs → "microseconds" — millionth (10-6 s)
ns → "nanoseconds" — billionth (10-9 s)
500 µs = 0.5 ms, so it is faster (shorter) than a millisecond. Saying "mew-seconds" as shorthand for µs happens informally, but "microseconds" is the correct full reading. "u-seconds" (reading µ as the letter u) is a typists workaround, not spoken English.
3 / 5
A storage vendor lists a disk as 1 TB but the OS reports about 931 GB. How do you explain this aloud using the right units?
Decimal TB vs binary TiB — the "missing space" myth:
Drive makers use decimal units: 1 TB = 1,000,000,000,000 bytes (1012). Operating systems often count in binary: 1 TiB = 1,099,511,627,776 bytes (240).
So 1 TB = 1,000,000,000,000 bytes ÷ 1,073,741,824 (a GiB) ≈ 931 GiB. Nothing is lost; the units differ.
The full binary ladder (IEC 80000-13):
KiB — "kibibyte" — 1,024 bytes
MiB — "mebibyte" — 1,024 KiB
GiB — "gibibyte" — 1,024 MiB
TiB — "tebibyte" — 1,024 GiB
In speech, many engineers still say "gigabyte" loosely for both — use the "-bibyte" forms when precision matters.
4 / 5
A driver datasheet describes a bus as 64-bit. How is "64-bit" read aloud?
64-bit = "sixty-four bit":
The number is read as a normal whole number — "sixty-four" — followed by the unit "bit" (singular when used attributively, as an adjective).
"a sixty-four-bit processor" — adjective before a noun; "bit" stays singular.
"the address space is sixty-four bits wide" — here "bits" is plural because it is a count, not a modifier.
Common architecture readings:
32-bit → "thirty-two bit"
64-bit → "sixty-four bit"
128-bit → "one-twenty-eight bit" or "a hundred and twenty-eight bit"
Note: it is "bit" (binary digit), not "byte". A 64-bit register holds 64 bits = 8 bytes. Reading it as "sixty-four bytes" or "six-four bit" (spelling digits) is wrong for architecture widths.
5 / 5
Comparing two NICs, one is 1 Gigabit and the other 1 Gigabyte per second. Which statement is correct?
Gigabit vs Gigabyte — a factor of 8:
A byte is 8 bits, so per second:
1 Gbps — "one gigabit per second" — the common Ethernet/NIC rating.
1 GB/s — "one gigabyte per second" — equals 8 Gbps, i.e. eight times the bit rate.
So 1 gigabyte per second is the larger data rate. The word that ends in "-byte" is always 8x the same-prefix "-bit" figure.
Say them distinctly: stress the final syllable so listeners hear "giga-BIT" vs "giga-BYTE". In noisy calls, spell it: "that is a lower-case b, gigabit."
Quick conversions:
1 Gbps ≈ 125 MB/s ("one twenty-five megabytes per second")
1 GB/s = 8 Gbps
Wrong ideas: bits and bytes are not interchangeable, neither "travels faster", and gigabytes per second is a perfectly valid throughput unit (used for PCIe, memory, NVMe).