They really shouldn't; I work in IT, and typically describe file sizes to my clients using the metric prefixes; if they're curious I'll explain the difference (

They really shouldn't; I work in IT, and typically describe file sizes to my clients using the metric prefixes; if they're curious I'll explain the difference (1000 is actually 1024 at each level) but the difference is usually negligible, and modern operating systems round the difference away when displaying the simplified sizes to the user.