1GB 디스크가 1024MB가 아닌 1073MB로 표시되는 이유는 무엇입니까?

fdisk -l/dev/sdd디스크의 출력 조각 표시1GB크기:

fdisk -l

Disk /dev/sdd: 1073 MB, 1073741824 bytes 255 heads, 63 sectors/track, 130 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x8bd61ee2

Device Boot      Start         End      Blocks   Id  System

/dev/sdd1 1 130 1044193+ 83 Linux LVM