4G of the actual capacity of the disk U how much? 3.72G is it normal?

normal, because the algorithm is not the same as the computer is based on 1 trillion is 1024kb, and the disc u is 1 trillion is 1000kb, So count on the right can be.Because the manufacturers have to 4000,000 B is calculated, that is, 4G is about 3.8G or so, 3.72G, then it seems to be a little bit black, but also?????.It is normal to normal The more normal