As @aikebah also points out above, this is not true

You’re talking about binary units and the prefixes are different for that. The prefixes k, M, G, B, T (and PEZYRQ…) are decimal (base 10) prefixes as defined in bad – These are kilo, mega, giga, etc. Binary prefixes are Ki, Mi, Gi, Ti (and Pi, Ei, Zi, Yi, etc.). This means kibi, mebi, gibi, etc.

Furthermore, there are also a few JEDEC standards from the 1990s that largely use SI prefixes, but in binary arithmetic. Hence the confusion. However, they are used less and less, precisely because they are meaningless. SI has been around long before JEDEC began, and has now all been standardized in ISO/IEC 80000 – or ISQ, which now forms the basis for SI. All this was created in 2008.

Windows still uses JEDEC prefixes; So when Windows says the file size is 1MB, it should actually be 1MB or 1.05MB (roughly, that’s of course 1.048576). Apple (as is often the case) has kind of given up on that. macOS from 10.6 (2009) is decimal, on iOS it is only from iOS 11 (2017) and watchOS is still binary. Hard drive manufacturers have always used SI prefixes; When they talk about 1 megabyte, they actually mean 1 million bytes. Therefore, a 1TB hard disk (1 Terrabytes) so if 931 “GB” is displayed; So that’s 931 gigabytes, not gigabytes. The fault lies with Microsoft (and formerly Apple), not the hard drive manufacturers. They use the correct prefix.

The only exception in all this is “k” prefixes. The kilo (10^3) ​​in the International System of Units has the prefix k, i.e. one a little letter k The IEC counterpart is Ki. “KB” always means the same as “KiB”, because KB is defined by JEDEC as 1024 bytes and “KB” does not exist in SI. MB, GB, TB (JEDEC did not go further; they do not have a prefix for 1 babybyte ) is ambiguous, because it is equivalent to MiB/GiB/TiB.

Edit: By the way, let’s guess which country JEDEC originally comes from and why they use the letter K incorrectly… The country where dates are written in a way that makes no sense at all and where everything is measured using limbs and random things

[Reactie gewijzigd door Werelds op 20 december 2023 14:04]