Re: fdisk +size{K,M,G} is it 2^N or 10^N? Both ,I think

Hi, just wondering when the next meeting at Filadelfio's is?

Cheers, Steve.

On 16/05/2014, Reece Arnott <[email protected]> wrote:
> I'm tracking down an issue and needed to know the exact number of bytes
> I'm creating a partition with using n fdisk script so I've looked in the
> source code (on my ubuntu 14.04 machine this is done with 'sudo apt-get
> source util-linux' and from looking specifically at the read_int_sx
> function it looks like there is an un-documented feature...
>
> When you create a partition when you have decided where it starts (enter
> to take the default), you are asked for the end which you can give as
> the end or additional sector/cylinder number or set it based on an
> additional size in K, M, or G.
>
> What I wanted to know was was if 1K=1000 or 1024 bytes (10^3 vs 2^10),
> 1M=1,000,000 or 1024*1024 bytes (10^6 vs 2^20) etc.
> It looks like you can actually give 6 options by including the
> undocumented option of a B as well:
> K = 2^10 bytes
> M = 2^20 bytes
> G = 2^30 bytes
> KB = 10^3 bytes
> MB = 10^6 bytes
> GB = 10^9 bytes
>
> I haven't got a spare machine to play with at the moment (this is a bit
> of research I bought home from work with me) so I don't know if this is
> actually the case but thought I'd share it anyway and assume someone
> will tell me if I've read it wrong.
> (the fdisk.c file I was looking at was last modified 18th October 2011
> and the util-linux version is 2.20.1-5.1ubuntu20)
>
> --
> "Believing men would act in their own interest was not cynicism, it turned
> out, but sheerest optimism; in reality men do not meet so high a standard."
> -- Harry Potter and the Methods of Rationality (Chapter 84)
> http://hpmor.com/
>
> Reece Arnott
> Dunedin
> New Zealand
>
>
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