The reason that advertised space and windows disagree is that drive
makers use powers of ten while windows uses multiples of powers of 2
(same as memory). The wndows division factors are larger than used by
So a drive maker gigabyte is 1,000,000,000 bytes while a windows
gigabyte is 1,073,741,824 bytes. 32,000,000,000/1,073,741,824 ~=29.8gb
(as shown by windows explorer).