这是 fdisk 的输出：
[root@ns1 ~]# fdisk -l
Disk /dev/sda: 21.4 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sda1 * 1 13 104391 83 Linux
/dev/sda2 14 268 2048287+ 82 Linux swap / Solaris
/dev/sda3 269 2611 18818810 83 Linux
但是当我尝试使用 e2label 时，我收到以下结果：
[root@ns1 ~]# e2label /dev/sda
e2label: Bad magic number in super-block while trying to open /dev/sda
Couldn't find valid filesystem …