硬盘有255磁头,63扇区 512byte*255*63 =8225280byte =7.84423828125MB 例如:40G 40*1024MB=40960MB 需柱面: 40960÷7.84423828125=5221.66 应分M: 5222*7.84423828125 =40962.6123046875 =40963