這是2進制和10進制的誤差2G=2,000,000,000 Byte10進制是2,000,000,000 Byte/ 1,000 / 1,000 / 1,000 = 2G = 2,000 MB2進制,實際上卻是2,000,000,000 Byte / 1,024 /1,024 /1,024 =1.862 G =1,862 MB