关于硬盘分区：主分区（包含扩展分区）、逻辑分区，主分区最多有4个（包含扩展分区）。

因此我们在对硬盘分区时最好划分主分区连续，比如说：主分区一、主分区二、扩展分区。

此文章以fdisk工具为例，对一个硬盘划分。

1、fdisk -l 查看系统上的硬盘，找到需要分区的硬盘后比如说：/dev/sdb.

然后，fdisk /dev/sdb

进入该设备。此时出现：

Command (m for help):

查看帮助信息：输入m，看到如下信息

Command action
?? a?? toggle a bootable flag
?? b?? edit bsd disklabel
?? c?? toggle the dos compatibility flag
?? d?? delete a partition?? 注：这是删除一个分区的动作；
?? l?? list known partition types 注：l是列出分区类型，以供我们设置相应分区的类型；
?? m?? print this menu 注：m 是列出帮助信息；
?? n?? add a new partition 注：添加一个分区；
?? o?? create a new empty DOS partition table?
?? p?? print the partition table 注：p列出分区表；
?? q?? quit without saving changes 注：不保存退出；
?? s?? create a new empty Sun disklabel????
?? t?? change a partition's system id 注：t 改变分区类型；
?? u?? change display/entry units?
?? v?? verify the partition table
?? w?? write table to disk and exit 注：把分区表写入硬盘并退出；
?? x?? extra functionality (experts only) 注：扩展应用，专家功能；

具体每个参数的含义，请仔细阅读。常用的就是：d l m p q t w

2、列出当前操作硬盘的分区情况，用p

Command (m for help):?p

Disk /dev/sda: 1035 MB, 1035730944 bytes
256 heads, 63 sectors/track, 125 cylinders
Units = cylinders of 16128 * 512 = 8257536 bytes

?? Device Boot????? Start???????? End????? Blocks?? Id System
/dev/sda1?????????????? 1????????? 25????? 201568+?? c W95 FAT32 (LBA)
/dev/sda2????????????? 26???????? 125????? 806400??? 5 Extended
/dev/sda5????????????? 26????????? 50????? 201568+ 83 Linux
/dev/sda6????????????? 51????????? 76????? 200781?? 83 Linux

?

3、通过fdisk的d指令来删除一个分区

?

Command (m for help): p??? 注：列出分区情况；

Disk /dev/sda: 1035 MB, 1035730944 bytes
256 heads, 63 sectors/track, 125 cylinders
Units = cylinders of 16128 * 512 = 8257536 bytes

?? Device Boot????? Start???????? End????? Blocks?? Id System
/dev/sda1?????????????? 1????????? 25????? 201568+?? c W95 FAT32 (LBA)
/dev/sda2????????????? 26???????? 125????? 806400??? 5 Extended

/dev/sda5????????????? 26????????? 50????? 201568+ 83 Linux
/dev/sda6????????????? 51????????? 76????? 200781?? 83 Linux

Command (m for help): d 注：执行删除分区指定；
Partition number (1-6): 6 注：我想删除 sda6 ，就在这里输入 6 ；

Command (m for help): p 注：再查看一下硬盘分区情况，看是否删除了？

Disk /dev/sda: 1035 MB, 1035730944 bytes
256 heads, 63 sectors/track, 125 cylinders
Units = cylinders of 16128 * 512 = 8257536 bytes

?? Device Boot????? Start???????? End????? Blocks?? Id System
/dev/sda1?????????????? 1????????? 25????? 201568+?? c W95 FAT32 (LBA)
/dev/sda2????????????? 26???????? 125????? 806400??? 5 Extended
/dev/sda5????????????? 26????????? 50????? 201568+ 83 Linux

Command (m for help):
警告：删除分区时要小心，请看好分区的序号，如果您删除了扩展分区，扩展分区之下的逻辑分区都会删除；所以操作时一定要小心；如果知道自己操作错了，请不要惊慌，用q不保存退出；切记切记！！！！在分区操作错了之时，千万不要输入w保存退出！！！

?

4、通过fdisk的n指令增加一个分区

?

Command (m for help): p

Disk /dev/sda: 1035 MB, 1035730944 bytes
256 heads, 63 sectors/track, 125 cylinders
Units = cylinders of 16128 * 512 = 8257536 bytes

?? Device Boot????? Start???????? End????? Blocks?? Id System
/dev/sda1?????????????? 1????????? 25????? 201568+?? c W95 FAT32 (LBA)
/dev/sda2????????????? 26???????? 125????? 806400??? 5 Extended
/dev/sda5????????????? 26????????? 50????? 201568+ 83 Linux

Command (m