Re: [PATCH v3 3/4] x86/efi: print size in binary units in efi_print_memmap
From: H. Peter Anvin
Date: Sat Jan 23 2016 - 15:44:19 EST
On January 23, 2016 12:29:26 PM PST, One Thousand Gnomes <gnomes@xxxxxxxxxxxxxxxxxxx> wrote:
>All a bit revisionist. Everyone else on the planet was upset about it
>because it broke things like calculating bit density because the
>for the bit capacity are not in metric form. BIPM (keeper of the SI
>units) never approved powers of two as an interpretation. IEC came into
>line in 1999, ISO followed.
>Disk sizes have been decimal since at least the 1970s. The original IBM
>10MB hard disc for example was 10MB not 10MiB.
>Powers of two are only validly referred to as KiB, MiB, GiB as of all
>current standard body positions. Powers of 10 based units are kB, MB,
>(The best one is CD and DVD: DVD uses the proper definition, CD uses
>although given the multiple sector sizes and encodings on CD it's all
Then there are oddball definitions like 1 MB = 1,024,000, which IBM used for disk for a long time. At least IEC tried to come up with a unambiguous way to denote these prefixes. It was less of an issue for kilo- since the binary prefix was always capitalized.
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