has to do with the way its reporting counted bytes, not how much is physically there or usable.
windows generally uses the convention 1KB=1024 bytes, while unix derivatives use 1KB=1000 bytes. Just a different way of reporting how much is there, like inches/centimeters... both measure the same distance!
Aha, but why is ubuntu 32bit reporting 7.9GiB and ubuntu 64bit reporting 7.8GiB
I could understand the difference between linux and windows. But ubuntu? with its 32 and 64 bit?...