IIRC that's because manufacturers of these devices use standard metric values to describe disk space e.g. 1000KB = 1MB, 1000MB = 1GB, and so on. A computer however measures space using binary such that 1024KB = 1MB, 1024MB = 1GB

the tale of gib and gb

the photo made it 10000x funnier

Also drivers take space.

You got 64 GB, not 64 GiB.

Dare is say 1024 times?

That is one of the reasons, but the main one is because formatting takes space. When you format a drive for it to be able to be recognised by an OS, you have to give it a filesystem, which fills parts of the disk with information and reserves other parts to store file locations.

The same thing happened with floppy disks. Even though they were 2Mb drives, you could only use 1.44Mb of the total space.

in a usb stick?

There have been lawsuits about this from customers who wanted the extra space, but drive manufacturers continue to misuse it to make it appear larger than it actually is

Manufacturers are using correct formats, they’re declaring capacity in GB which is a number based on 10 (1000 MB and such), windows on the other hand is miss leading people by showing the binary based value (such as 1024 MiB) and using the wrong unit (they’re writing GB where it should be GiB). If you tried to use any operating system that shows units correctly you’d see that it says GiB.

64,000,000 / (1024^3 ) is still 59.6... Where'd my 2GB go?