On Tue, Jan 07, 2025 at 11:05:01AM -0500, e...@gmx.us wrote: > On 1/7/25 10:44, Dan Purgert wrote: > > On Jan 07, 2025, Stefan Monnier wrote: > >>> 8 TB is not that big. I have a external 18 TB drive. It is 18 TB in name > >>> only though! After fromating it with ext4 it only had 15TB of usuable > >>> space. > >> > >> 18TB "on paper" is usually 18 * 1000^4 bytes, so if you convert this > >> into "computer units" is ~16.37 * 1024^4 bytes. If you then make an > >> ext4 filesystem on it with the customary 5% reserved for root, that gets > >> you down to 15.5TB, to which you also have to remove the space used by > >> inodes, so yes, probably about 15TB and of course, once you start > >> putting actual files ion the drive, additional space will be used by > >> directories and metadata. > > > > Now now, let's not derail a rant with facts :) > > > > That being said, I thought the variance from TB -> TiB was 10%; or have > > I gotten it backwards? > > My intuition votes for 1-1000/1024 = 1-125/128 which is approximately 2.35% > but it's been wrong before.
That would be for KB, but Tera is the third power of that. So it's about three times 2.35%, if you throw away the higher order terms (we physicists are cheap, like that ;-) Cheers -- t
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