fdisk的意思是固定磁盘(fixed disk)或格式化磁盘(format disk),该命令的功能是管理磁盘的分区信息。
fdisk命令可以用来对磁盘进行分区操作,用户可以根据实际情况对磁盘进行合理划分,这样后期挂载和使用时会方便很多。
**语法格式:**fdisk 参数 设备名
常用参数:
|----|-----------|---|----|----------------| | -b | 设置每个分区的大小 | | -l | 显示指定的外围设备分区表状态 | | -c | 关闭DOS兼容模式 | | -s | 显示指定的分区大小 | | -C | 设置硬盘的柱面数量 | | -S | 设置每个磁道的扇区数 | | -h | 显示帮助信息 | | -u | 以分区数目代替柱面数目 | | -H | 设置硬盘的磁头数 | | -v | 显示版本信息 |
参考示例
查看当前系统的分区情况:
[root@linuxcool ~]# fdisk -l
Disk /dev/sda: 20 GiB, 21474836480 bytes, 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
Disklabel type: dos
Disk identifier: 0x5f1d8ee5
Device Boot Start End Sectors Size Id Type
/dev/sda1 * 2048 2099199 2097152 1G 83 Linux
/dev/sda2 2099200 41943039 39843840 19G 8e Linux LVM
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管理指定硬盘的分区(具体过程可以参考《Linux就该这么学(第2版)》第6章):
[root@linuxcool ~]# fdisk /dev/sda
Welcome to fdisk (util-linux 2.32.1).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
Command (m for help): n
All space for primary partitions is in use.
Command (m for help): m
Help:
DOS (MBR) a toggle
a bootable flag
b edit nested BSD disklabel
c toggle the dos compatibility flag
Generic
d delete a partition
F list free unpartitioned space
l list known partition types
n add a new partition
p print the partition table
t change a partition type
v verify the partition table
i print information about a partition
Misc
m print this menu
u change display/entry units
x extra functionality (experts only)
Script
I load disk layout from sfdisk script file
O dump disk layout to sfdisk script file
Save & Exit
w write table to disk and exit
q quit without saving changes
Create a new label
g create a new empty GPT partition table
G create a new empty SGI (IRIX) partition table
o create a new empty DOS partition table
s create a new empty Sun partition table
..................省略部分输出信息..................