Linux中磁盘mbr分区——实践篇

fdisk命令

语法

fdisk(选项)(参数)

选项

-b <分区大小> 指定每个分区的大小 -l 列出分区表信息 -v 显示版本信息

参数

设备文件：例如/dev/sda

实例

选择要操作的磁盘：

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

输入m可列出可以执行的命令：

Command (m for help): m Command action a toggle a bootable flag b edit bsd disklabel c toggle the dos compatibility flag d delete a partition # 删除分区 l list known partition types # 显示已知的分区类型 m print this menu # 显示帮助菜单 n add a new partition # 添加分区 o create a new empty DOS partition table p print the partition table # 查看分区表 q quit without saving changes # 不保存退胡 s create a new empty Sun disklabel t change a partition's system id # 该表分区的系统id u change display/entry units v verify the partition table w write table to disk and exit # 保存分区并退出 x extra functionality (experts only)

查看分区表：

Command (m for help): p Disk /dev/sdb: 10.7 GB, 10737418240 bytes 255 heads, 63 sectors/track, 1305 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x48283ee0 Device Boot Start End Blocks Id System

新建分区表：

Command action #选择新增分区类型 e extended #扩展分区 p primary partition (1-4) #主分区 p // 键入p Partition number (1-4): 1 // 键入1 First cylinder (1-1305, default 1): # 选择分区起点柱面 Using default value 1 //选择默认1 Last cylinder, +cylinders or +size{K,M,G} (1-1305, default 1305): +1G #设置分区大小1G,+表示往起点后添加，-表示往起点前添加分区

查看确认分区创建成功：

Command (m for help): p Disk /dev/sdb: 10.7 GB, 10737418240 bytes # 磁盘总大小 10.7GB 255 heads, 63 sectors/track, 1305 cylinders # 255个磁头，每个磁道63个扇区，1305个圆柱面 Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x48283ee0 Device Boot Start End Blocks Id System /dev/sdb1 1 132 1060258+ 83 Linux 
再建立一个扩展分区

Command (m for help): n
Command action e extended p primary partition (1-4) e Partition number (1-4): 4 # 分区号 First cylinder (133-1305, default 133): 900
Last cylinder, +cylinders or +size{K,M,G} (900-1305, default 1305): +500M # 扩展分区500M

 

在扩展分区中创建逻辑分区

Command (m for help): n

Command action

l logical (5 or over)

p primary partition (1-4) l

First cylinder (900-964, default 900):

Using default value 900 Last cylinder, +cylinders or +size{K,M,G} (900-964, default 964): +100M  # 逻辑分区100M

 

查看分区列表

Command (m for help): p Disk /dev/sdb: 10.7 GB, 10737418240 bytes 255 heads, 63 sectors/track, 1305 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x48283ee0 Device Boot Start End Blocks Id System /dev/sdb1 1 132 1060258+ 83 Linux /dev/sdb4 900 964 522112+ 5 Extended /dev/sdb5 900 913 112423+ 83 Linux

保存退出

Command (m for help): w # 保存退出 The partition table has been altered! Calling ioctl() to re-read partition table. Syncing disks.

查看

[root@vathe ~]#lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sr0 11:0 1 3.7G 0 rom sda 8:0 0 200G 0 disk ├─sda1 8:1 0 200M 0 part /boot ├─sda2 8:2 0 20G 0 part /data ├─sda3 8:3 0 10G 0 part /home ├─sda4 8:4 0 1K 0 part ├─sda5 8:5 0 2G 0 part [SWAP] └─sda6 8:6 0 167.8G 0 part / sdb 8:16 0 10G 0 disk # 显示分区成功 ├─sdb1 8:17 0 1G 0 part ├─sdb4 8:20 0 1K 0 part └─sdb5 8:21 0 109.8M 0 part

分区成功，当然，要使用磁盘，还需要进行两部操作，才能使用磁盘——将磁盘挂载在具体目录（或文件），和对个分区进行格式化。