When communicating in IT it is essential that you uses the correct units.
Often people mixes m with M. And a "m" = 0.001 aka milli and a "M" = 1 000 000 aka mega.
Another mixup is the usage of "b" or "B". A "b" is a bit and a "B" is a byte and one byte consist of eight bits.
Check out SI prefixes here
https://en.wikipedia.org/wiki/International_System_of_Units
b
https://en.wikipedia.org/wiki/Bit
B
https://en.wikipedia.org/wiki/Byte