On 1/7/25 11:31, to...@tuxteam.de wrote: > 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 ;-)
Right you are. Apparently I suck at exponential math. I must have been asleep that week.
