I ve been working in computers since 1980 at the industry level Kilobytes are KB Megabytes are MB Gigabytes are GB Terabytes are TB etc I ve never been in any computer firm be it a game developer IBM Apple a movie company or a technology company that uses MiB or anything that kooky In fact my computer science professors will in the classes I ve taken outright mark the paper a failure if anything but MB is used Also Kilobit Megabit Gigabit etc are as such Kb Mb Gb etc The only place this MiB junk is used in in Wikipedia