data unit conversion

https://astro-wiki.win/index.php/Understanding_Petabyte_to_Terabyte_Conversion:_A_Practical_Guide_for_Data_Storage_Professionals

Switching between kilobytes and gigabytes feels like juggling zeros, especially when you're trying to figure out if that 5GB folder will fit on a 32GB USB stick. It's basically multiplying or dividing by 1024 each step, though hard drive makers sometimes round to 1000 for a more optimistic number.