关于fdisk命令

fdisk命令用于观察硬盘实体使用情况，也可对硬盘分区。

[root@loclhost ~]# fdisk  /dev/sdb

Command (m for help): m         #输入m列出常用的命令

Command action

   a   toggle a bootable flag               #切换分区启动标记

   b   edit bsd disklabel                   #编辑sdb磁盘标签

   c   toggle the dos compatibility flag    #切换dos兼容模式

   d   delete a partition                   #删除分区

   l   list known partition types           #显示分区类型

   m   print this menu                       #显示帮助菜单

   n   add a new partition                  #新建分区

   o   create a new empty DOS partition table   #创建新的空白分区表

   p   print the partition table            #显示分区表的信息

   q   quit without saving changes          #不保存退出

   s   create a new empty Sun disklabel     #创建新的Sun磁盘标签

   t   change a partitions system id        #修改分区ID,可以通过l查看id

   u   change display/entry units           #修改容量单位,磁柱或扇区

   v   verify the partition table           #检验分区表

   w   write table to disk and exit         #保存退出

   x   extra functionality (experts only)   #拓展功能

fdisk创建主分区

Command (m for help): n

Partition type:

   p   primary (0 primary, 0 extended, 4 free)  #主分区

   e   extended  #扩展分区

Select (default p): p   #选择创建主分区

Partition number (1-4, default 1):  #默认创建第一个主分区

First sector (2048-2097151, default 2048): #默认扇区回车

Using default value 2048

Last sector, +sectors or +size{K,M,G} (2048-2097151, default 2097151): +50M #分配50MB

fdisk创建扩展分区

Command (m for help): n  #新建分区

Partition type:

   p   primary (1 primary, 0 extended, 3 free)

   e   extended

Select (default p): e   #创建扩展分区

Partition number (2-4, default 2):

First sector (104448-2097151, default 104448):

Using default value 104448

Last sector, +sectors or +size{K,M,G} (104448-2097151, default 2097151): #空间都给到扩展分区

fdisk创建逻辑分区

Command (m for help): n  #新建分区

Partition type:

   p   primary (1 primary, 1 extended, 2 free)

   l   logical (numbered from 5)

Select (default p): l   #创建逻辑分区

Adding logical partition 5

First sector (106496-2097151, default 106496):

Using default value 106496

Last sector, +sectors or +size{K,M,G} (106496-2097151, default 2097151): +100M  #分配100MB空间

fdisk查看分区情况，并保存

Command (m for help): p #查看分区创建

Device Boot      Start         End      Blocks   Id  System

/dev/sdb1            2048      104447       51200   83  Linux

/dev/sdb2          104448     2097151      996352    5  Extended

/dev/sdb5          106496      311295      102400   83  Linux

#保存分区

Command (m for help): w

The partition table has been altered!

Calling ioctl() to re-read partition table.

Syncing disks.