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Mbps is left over from the early day of dial up modems where the bit rate were in the low Kbps. Keeping things in bits/sec is good. A byte is 8 bits. Digital words have different numbers of bits (8, 16, 32, 64 etc). Regardless of word size the bit/sec rate can be converted to number of words/sec. If they changed to MBytes/sec, to convert to words/sec you'd have to multiply by 8 then divide by 16, 32, 64 etc. as it is now you just divide the bps by the word length (16, 32, 64) to get the word/sec number.