Bus and line speeds always used powers of 10. Different disk formats used different conventions.[1][2] [1] https://en.wikipedia.org/wiki/Kilobyte#Examples http

Bus and line speeds always used powers of 10. Different disk formats used different conventions.[1][2] [1] https://en.wikipedia.org/wiki/Kilobyte#Examples https://en.wikipedia.org/wiki/Kilobyte#Examples [2] https://en.wikipedia.org/wiki/Megabyte#Definitions https://en.wikipedia.org/wiki/Megabyte#Definitions