Suppose you have 8 Mbit / s (8Mb / s) internet connection, that means you will be able to transfer data to 8 Mbitbit speed per second. But, while downloading a file from the Internet, you might see, downloading the file in 1MB / s (1MB / s) speed, what is the matter? Are you getting less speed? No, no! Here you can call 8 megabits, and say 1 mbbit speed speed, the measurement in both cases is the same.
Because, Mb and MB are the same in two term pronouncements, not one thing. Here Mb refers to Megabit and MB is defined as Megabyte. Remember, you're downloading a 750 MB file, which means technically 750 MB in size, and at the same time its size is 6,000 Mbit (6000 Mb).