Universal request to all when doing technical documentation - "MBytes/sec" and "Mbits/sec" are much clearer, and leave only the doubt as to whether you mean 2^20 or 10^6 (and, in 95% of use cases, 10^6 is the correct choice, both syntactically, as well as in what you are actually measuring - data rates are almost always in SI units)
Comments
Universal request to all when doing technical documentation - "MBytes/sec" and "Mbits/sec" are much clearer, and leave only the doubt as to whether you mean 2^20 or 10^6 (and, in 95% of use cases, 10^6 is the correct choice, both syntactically, as well as in what you are actually measuring - data rates are almost always in SI units)