there 1024 MB=1GB and i not was sure if 1.000.000.000 bytes is 1 GB or 1.024.000.000 is 1GB.
I hate to pile on, but you are absolutely incorrect in your claim that there are 1024 MB in 1 GB. Relying on non-authoritative websites for your source of truth does nothing to resolve the error.
The SI system was devised ages ago, and is universally used as the measure of such things. The prefix G or giga
always denotes 10^9.
Some time ago, lazy programmers noted that 2^10 is
kinda sorta approximately equal 10^3. So they started sloppily referring to 2^10 as kilo, 2^20 as mega, etc. But this has introduced error and ambiguity where none is warranted. And this ambiguity has killed.
If you mean 2^30, then the proper prefix is Gi or gibi. The scientific and engineering standards communities are universally aligned on this point. Or to make it concrete for you, 1024 MiB = 1 GiB.
https://en.wikipedia.org/wiki/Binary_prefix and while WikiPedia is only quasi-authoritative, they provide more explanation that truly authoritative sites such as the National Institute of Standards and Technology:
https://physics.nist.gov/cuu/Units/binary.htmlAnd for the love of all that is holy, stop misusing SI prefixes. Before they kill again.