why partition size is smaller than I defined

Yesterday, I partitioned my hard disk. I defined the size of partition 1 20480 MB (20 GB), but what I got is 19.X GB. Any DaXia know why?

所有跟帖： 

• not DaXia, (X－1)*4+1024*X=Y ? -我稀飯搗亂- ♀ (22 bytes) () 04/30/2008 postreply 15:30:43

• 嗬嗬，搗亂小算盤打得挺精 -ohlalala- ♀ (0 bytes) () 04/30/2008 postreply 20:51:46

• 我很迷惑啊經常，這次對了嘛？。。。 -!?- ♀ (9 bytes) () 04/30/2008 postreply 21:16:39

• 謝謝小搗亂，你還真夠搗蛋 -荊楚農夫- ♀ (34 bytes) () 05/01/2008 postreply 06:46:06