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Imagine buying 14TB and find out that it is 12TB instead.
I've always known the advertised space is larger than the actual space, but it was never quite the shock as it was when I recently bought an 18TB external drive with ~16 TB usable.
18 "TB" with ~16 TiB usable 😞 they scammed us so hard they renamed TB and GB
It was so during the age of floppy discs. Our computers use TiB, marketers use TB to sell storage
The biggest problem is that Windows still calls TiB and friends with si prefixes (so 1TiB shows as 1TB). MS has done this since DOS (but at least back then MiB didn't exist. They could've used base 10 though).
TiB (and the related) didn't get named until recently, and I think only Linux uses those abbreviations — and not universally — windows still says kB, mB etc, while using the binary equivalents
"recently", they are the standard for almost 25 years now.
A 14 TB medium is always 14 TB, which is close to 12 TiB. Minus metadata of the filesystem and granularity of a allocation sector.