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![](https://fry.gs/pictrs/image/c6832070-8625-4688-b9e5-5d519541e092.png)
when you format a 256GB drive and find out that you don’t actually have 256GB
Most of the time you have at least 256GB. It’s just you 256GB=238.4GiB, and windows reports GiB but calls them GB. You wouldn’t have that problem in Mac OS that counts GB properly, or gnome that counts GiB and calls them GiB.
(This is ignoring the few MB that takes to format a drive, but that’s also space on the disk and you’re the one choosing to partition and format the drive. If you dumped a file straight into the drive you’d get that back, but it would be kind of inconvenient)
The US customary units are officially defined on top of metric, and 1 fl oz is 29.5735295625 mL, but an oz is 28.349523125 g. I imagine this decision was just to fuck with people (since 1ml of water weighs 1g at sea level, at 4°)