Oh, Those Terrible Units
There are some numbers and units. Numbers are numbers. Units are units. Numbers informs how many. Units inform about two things:
- how many
- of what
The SI Base Units
|mole||mol||amount of substance|
IT Base Units
|bit||b||number of bits|
|byte||B||number of bytes|
|bits per second||bps||number of bits per second|
Have you seen the difference? BYTES and BITS?
The Word Of Truth
- 1 BYTE = 8 BITS
- 1 B = 8 b
- bit represents logical value (True or False), (0 or 1)
- there is nothing smaller than 1b
- you cannot have half of a bit - what is the half of False?
These symbols are used for avoiding too many zeros. So instead of
1000m you can write
1km and instead of
1000000B you can write
1GB. This is another problem. Normally
1 kilobyte =
1024 bytes. Yea, the IT world is wierd. For distinguishing between
10^3 = 1000 and
2^10 = 1024 someone created some binary system:
Now we’ve got 1024B = 1KiB and so on.
Why am I writing all that? Because I don’t understand why many people in the IT world, including many programmers, still don’t know that this is important to write according to some standards. This is like a language: you have to use the correct grammar so others have the chance to understand correctly what you say.
Some Examples From Web
1KB– this means
1 Kelvin Byte– I have no idea what it means. Author could think about:
1kB = 1000Bor
1KiB = 1024B.
1 milibit, this is
0.001 of bit. Bit is a logical value, basically it means
1. How can you have
0.001 of True or False? Maybe someone wants to write
1MB = 1,000,000B?
1mB– another funny, not found so often. This means
1 milibyte = 0.001B. But
8 bits. So this is
0.008 of True or False.
1gb– sorry, I have no idea what the
1gB– the same as above.
1kb– often author wants to write
1kb = 125B– quite unusual number of bytes.