fdisk命令
来源：原创 更新时间：2018-08-27 16:20:42 作者：管理员 浏览：2423
- 命令描述
- 命令语法
- 命令选项
-c 关闭DOS兼容模式
-u <size> 以扇区编号取代柱面编号来表示每个分区的起始地址，一般与-l选项联合使用
-C <number> 指定柱面编号
-H <number> 指定磁头编号
-S <number> 指定磁道扇区编号
-l 显示所有分区表
- 命令参数
- 内置功能及变量
b 编辑BSD磁盘标签
c 设置DOS操作系统兼容标记（兼容/不兼容之间切换）
d 删除一个分区
l 显示已知的分区类型，其中82为Linux swap分区，83为Linux分区
m 显示帮助信息
n 增加一个新的分区
o 创建一个新的空白的DOS分区表
p 显示磁盘当前的分区表
q 退出fdisk程序，不保存任何修改
s 创建一个新的空白的Sun磁盘标签
t 改变一个分区的系统ID，就是改变分区类型（比如把Linux Swap分区改为Linux分区）
u 改变显示或输入单位
v 验证磁盘分区表
w 将分区表写入磁盘并退出（保存并退出）
x 额外功能（专家级）
- 命令实例
实例1：显示分区表
[root@linuxbaodian /]# fdisk -l Disk /dev/sda: 8589 MB, 8589934592 bytes 255 heads, 63 sectors/track, 1044 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: 0x000267ce Device Boot Start End Blocks Id System /dev/sda1 * 1 26 204800 83 Linux Partition 1 does not end on cylinder boundary. /dev/sda2 26 124 786432 fd Linux raid autodetect Partition 2 does not end on cylinder boundary. /dev/sda3 124 1045 7396352 83 Linux Disk /dev/sdb: 213 MB, 213909504 bytes 64 heads, 32 sectors/track, 204 cylinders Units = cylinders of 2048 * 512 = 1048576 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x31f57818 Device Boot Start End Blocks Id System /dev/sdb1 1 204 208880 83 Linux WARNING: GPT (GUID Partition Table) detected on '/dev/sdc'! The util fdisk doesn't support GPT. Use GNU Parted. Disk /dev/sdc: 213 MB, 213909504 bytes 255 heads, 63 sectors/track, 26 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: 0x00000000 Device Boot Start End Blocks Id System /dev/sdc1 1 27 208895+ ee GPT Partition 1 has different physical/logical beginnings (non-Linux?): phys=(0, 0, 1) logical=(0, 0, 2) Partition 1 has different physical/logical endings: phys=(1023, 254, 63) logical=(26, 1, 39)
实例2：创建新分区
[root@linuxbaodian /]# fdisk /dev/sdb
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel with disk identifier 0xe8517189.
Changes will remain in memory only, until you decide to write them.
After that, of course, the previous content won't be recoverable.
Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)
WARNING: DOS-compatible mode is deprecated. It's strongly recommended to
switch off the mode (command 'c') and change display units to
sectors (command 'u').
Command (m for help): n
Command action
e extended //扩展分区，创建扩展分区会占用一个主分区，并且只有创建扩展分区后才能创建逻辑分区
p primary partition (1-4) //主分区，最多创建4个
e
Partition number (1-4): 1
First cylinder (1-2610, default 1): //起始柱面，默认为1
Using default value 1
Last cylinder, +cylinders or +size{K,M,G} (1-2610, default 2610): //终止柱面，默认为最后一个数
Using default value 2610
Command (m for help): n
Command action
l logical (5 or over) //逻辑分区
p primary partition (1-4) //主分区
l
First cylinder (1-2610, default 1): 1
Last cylinder, +cylinders or +size{K,M,G} (1-2610, default 2610): +10G //终止柱面不仅可以用柱面数表示，还可以用+[数值][单位]的格式表示
Command (m for help): n
Command action
l logical (5 or over)
p primary partition (1-4)
l
First cylinder (1307-2610, default 1307):
Using default value 1307
Last cylinder, +cylinders or +size{K,M,G} (1307-2610, default 2610):
Using default value 2610
Command (m for help): p
Disk /dev/sdb: 21.5 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 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: 0xe8517189
Device Boot Start End Blocks Id System
/dev/sdb1 1 2610 20964793+ 5 Extended
/dev/sdb5 1 1306 10490382 83 Linux
/dev/sdb6 1307 2610 10474348+ 83 Linux
Command (m for help): w //写入磁盘，保存并退出，否则之前的操作都无效。如果不想写入磁盘就使用q<br>The partition table has been altered!<br><br>Calling ioctl() to re-read partition table.<br>Syncing disks.
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