命令简介
fdisk 命令用于查看磁盘应用状况和磁盘分区，它可用于创立，删除和批改磁盘分区。
语法格局
disk [-uc] [-b sectorsize] [-C cyls] [-H heads] [-S sects] device
选项阐明
-b < 大小 > #扇区大小 (512、1024、2048 或 4096)
-c[=< 模式 >] #兼容模式：“dos”或“nondos”(默认)
-h #打印此帮忙文本
-u[=< 单位 >] #显示单位：“cylinders”(柱面) 或“sectors”(扇区，默认)
-v #打印程序版本
-C < 数字 > #指定柱面数
-H < 数字 > #指定磁头数
-S < 数字 > #指定每个磁道的扇区数
利用举例
抉择要进行操作的磁盘
[root@localhost ~]$ fdisk /dev/sdb
输出 m 查看可执行的命令
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
l list known partition types
m print this menu
n add a new partition
o create a new empty DOS partition table
p print the partition table
q quit without saving changes
s create a new empty Sun disklabel
t change a partition's system id
u change display/entry units
v verify the partition table
w write table to disk and exit
x extra functionality (experts only)
输出 p 列出磁盘目前的分区状况
Command (m for help): p
Disk /dev/sdb: 3221 MB, 3221225472 bytes
255 heads, 63 sectors/track, 391 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sdb1 1 1 8001 8e Linux LVM
/dev/sdb2 2 26 200812+ 83 Linux
输出 d 而后抉择分区，删除现有分区
Command (m for help): d
Partition number (1-4): 1
Command (m for help): d
Selected partition 2
查看分区状况，确认分区曾经删除
Command (m for help): print
Disk /dev/sdb: 3221 MB, 3221225472 bytes
255 heads, 63 sectors/track, 391 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
Command (m for help):
输出 n 建设新的磁盘分区，首先建设两个主磁盘分区
Command (m for help): n
Command action
e extended
p primary partition (1-4)
p #建设主分区
Partition number (1-4): 1 #分区号
First cylinder (1-391, default 1): #分区起始地位
Using default value 1
last cylinder or +size or +sizeM or +sizeK (1-391, default 391): 100 #分区完结地位，单位为扇区
Command (m for help): n #再建设一个分区
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 2 #分区号为 2
First cylinder (101-391, default 101):
Using default value 101
Last cylinder or +size or +sizeM or +sizeK (101-391, default 391): +200M #分区完结地位，单位为 M
确认分区建设胜利
Command (m for help): p
Disk /dev/sdb: 3221 MB, 3221225472 bytes
255 heads, 63 sectors/track, 391 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sdb1 1 100 803218+ 83 Linux
/dev/sdb2 101 125 200812+ 83 Linux
再建设一个逻辑分区
Command (m for help): n
Command action
e extended
p primary partition (1-4)
e #抉择扩大分区
Partition number (1-4): 3
First cylinder (126-391, default 126):
Using default value 126
Last cylinder or +size or +sizeM or +sizeK (126-391, default 391):
Using default value 391
确认扩大分区建设胜利
Command (m for help): p
Disk /dev/sdb: 3221 MB, 3221225472 bytes
255 heads, 63 sectors/track, 391 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sdb1 1 100 803218+ 83 Linux
/dev/sdb2 101 125 200812+ 83 Linux
/dev/sdb3 126 391 2136645 5 Extended
在扩大分区上建设两个逻辑分区
Command (m for help): n
Command action
l logical (5 or over)
p primary partition (1-4)
l #抉择逻辑分区
First cylinder (126-391, default 126):
Using default value 126
Last cylinder or +size or +sizeM or +sizeK (126-391, default 391): +400M
Command (m for help): n
Command action
l logical (5 or over)
p primary partition (1-4)
l
First cylinder (176-391, default 176):
Using default value 176
Last cylinder or +size or +sizeM or +sizeK (176-391, default 391):
Using default value 391
确认逻辑分区建设胜利
Command (m for help): p
Disk /dev/sdb: 3221 MB, 3221225472 bytes
255 heads, 63 sectors/track, 391 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sdb1 1 100 803218+ 83 Linux
/dev/sdb2 101 125 200812+ 83 Linux
/dev/sdb3 126 391 2136645 5 Extended
/dev/sdb5 126 175 401593+ 83 Linux
/dev/sdb6 176 391 1734988+ 83 Linux
Command (m for help):
保留操作信息
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
建设好分区之后咱们还须要对分区进行格式化能力在零碎中应用磁盘。这个格式化命令前面的章节会给大家进行具体解说。