You cannot change a partition into an extended one or vice versa Delete it first

    在Linux擴充套件LVM時，使用fdisk建立分割槽時，在磁碟上新建擴充套件分割槽（邏輯分割槽），修改分割槽格式，指定分割槽型別為8e時，報錯“You cannot change a partition into an extended one or vice versa Delete it first.”。 具體操作如下所示：

[root@get-linux01 ~]# fdisk /dev/sdc

The number of cylinders for this disk is set to 5221.
There is nothing wrong with that, but this is larger than 1024,
and could in certain setups cause problems with:
1) software that runs at boot time (e.g., old versions of LILO)
2) booting and partitioning software from other OSs
   (e.g., DOS FDISK, OS/2 FDISK)

Command (m for help): p

Disk /dev/sdc: 42.9 GB, 42949672960 bytes
255 heads, 63 sectors/track, 5221 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System

Command (m for help): n
Command action
   e   extended
   p   primary partition (1-4)
e
Partition number (1-4): 1
First cylinder (1-5221, default 1):
Using default value 1
Last cylinder or +size or +sizeM or +sizeK (1-5221, default 5221):
Using default value 5221

Command (m for help): t
Selected partition 1
Hex code (type L to list codes): 8e
You cannot change a partition into an extended one or vice versa
Delete it first.

Command (m for help): n
Command action
   l   logical (5 or over)
   p   primary partition (1-4)
l
First cylinder (1-5221, default 1):
Using default value 1
Last cylinder or +size or +sizeM or +sizeK (1-5221, default 5221):
Using default value 5221

Command (m for help): t
Partition number (1-5): 1
Hex code (type L to list codes): 8e
You cannot change a partition into an extended one or vice versa
Delete it first.

Command (m for help): p

Disk /dev/sdc: 42.9 GB, 42949672960 bytes
255 heads, 63 sectors/track, 5221 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sdc1               1        5221    41937651    5  Extended
/dev/sdc5               1        5221    41937619+  83  Linux

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.
Syncing disks.

其實出現這個錯誤，是因為分割槽號（Partition number）號弄錯了（因為必須保留1-4這4個數字給主分割槽和擴充套件分割槽使用，所以邏輯分割槽的數字必須從5開始）。赤裸裸的要被鄙視啊！ 按照下面操作即可解決問題。