fdisk 用来对磁盘进行分区，或者查看磁盘分区
root@ubuntu:~# fdisk -l
Disk /dev/sda: 21.5 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 cylinders, total 41943040 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0005b448
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 37797887 18897920 83 Linux
/dev/sda2 37799934 41940991 2070529 5 Extended
/dev/sda5 37799936 41940991 2070528 82 Linux swap / Solaris
fstab
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