1.fdisk -l
Disk /dev/sda: 120.0 GB, 120034123776 bytes =>硬盤容量120G
255 heads, 63 sectors/track, 14593 cylinders =>255個磁頭，63個扇區，14593個柱面
Units = cylinders of 16065 * 512 = 8225280 bytes =>每個柱面的容量是 8225280
=>存儲容量＝磁道（柱面）數×磁頭數×每道扇區數×每扇區字節數
14593×255×63×512＝111.788G
柱面容量＝磁頭數×每道扇區數×每扇區字節數 255×63×512=8225280 B
實際上硬盤廠家通常是按照1G＝1000計算的
Disk identifier: 0xc3ffc3ff
Device Boot Start End Blocks Id System =>start 表示的一個分區從X cylinder開始
/dev/sda1 * 1 3824 30716248+ 7 HPFS/NTFS
/dev/sda2 3825 10199 51200000 7 HPFS/NTFS
/dev/sda3 10200 12596 19253902+ 5 Extended
/dev/sda4 12597 14593 16040902+ 12 Compaq diagnostics
/dev/sda5 10200 10211 96358+ 83 Linux
/dev/sda6 10212 10454 1951866 82 Linux swap / Solaris
/dev/sda7 10455 11548 8787523+ 83 Linux
/dev/sda8 11549 12596 8418028+ 83 Linux
2.df:通過這個命令可以查看磁盤的使用情況以及文件系統被掛載的位置
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/sda7 8649544 1986948 6223220 25% /
tmpfs 1033648 0 1033648 0% /lib/init/rw
udev 10240 136 10104 2% /dev
tmpfs 1033648 0 1033648 0% /dev/shm
/dev/sda5 93307 19997 68493 23% /boot
