1, fdisk Profile
[root@localhost /]# whatis fdisk fdisk (8) - manipulate disk partition table # operation partition table
fdisk command applies to 2TB disk set below.
2, fdisk grammar
fdisk [disk name] For example: fdisk / dev / sdb
3, fdisk common options
| Options | Explanation |
| -l | All disk information display system, including partition information |
| -h | Displays Help |
| -v | Displays version information |
4. Examples
Information 1) View all system disks
[root@localhost /]# fdisk -l Disk /dev/sda:21.5 GB, 21474836480 bytes, 41943040 sectors # / dev / sda disk information Units = sectors of 1 * 512 = 512 bytes Sector size (logical / physical): 512 byte / 512 byte I / O Size (minimal / optimal): 512 byte / 512 byte Disk Label Type: dos Disk identifier: 0x00094c41 设备 Boot Start End Blocks Id System /dev/sda1 * 2048 1026047 512000 83 Linux /dev/sda2 1026048 41943039 20458496 8e Linux LVM Disk /dev/sdb:21.5 GB, 21474836480 bytes, 41943040 sectors # / dev / sdb disk information Units = sectors of 1 * 512 = 512 bytes Sector size (logical / physical): 512 byte / 512 byte I / O Size (minimal / optimal): 512 byte / 512 byte Disk / dev / mapper / rhel-swap: 2147 MB, 2147483648 bytes, the sector # 4194304 swap information Units = sectors of 1 * 512 = 512 bytes Sector size (logical / physical): 512 byte / 512 byte I / O Size (minimal / optimal): 512 byte / 512 byte Disk /dev/mapper/rhel-root:18.8 GB, 18756927488 bytes, 36634624 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical / physical): 512 byte / 512 byte I / O Size (minimal / optimal): 512 byte / 512 byte
2) Use fdisk command to / dev / sdb partition management
[root@localhost /]# fdisk /dev/sdb
Welcome to the fdisk (util-linux 2.23.2).
Change will stay in memory until you decide to write the changes to disk.
Please think twice before using the write command.
Device does not contain a recognized partition table
Use disk identifier 0x8b6742b9 create a new DOS disk label.
Command (input m to get help): m #m view help
Command Operation
a toggle a bootable flag
b edit bsd disklabel
c toggle the dos compatibility flag
d delete a partition #d delete partition
g create a new empty GPT partition table
G create an IRIX (SGI) partition table
l list known partition types
m print this menu #m view help
n add a new partition #n create partitions
o create a new empty DOS partition table
p print the partition table #p view the partition information
q quit without saving changes #q exit without saving
s create a new empty Sun disklabel
t change a partition's system id #t partition type conversion
u change display/entry units
v verify the partition table
w write table to disk and exit #w Save and Exit
x extra functionality (experts only)
Command (input m to get help): p #p view the partition information
Disk /dev/sdb:21.5 GB, 21474836480 bytes, 41943040 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical / physical): 512 byte / 512 byte
I / O Size (minimal / optimal): 512 byte / 512 byte
Disk Label Type: dos
Disk identifier: 0x8b6742b9
设备 Boot Start End Blocks Id System
Command (input m to get help): n #n add a partition
Partition type:
p primary (0 primary, 0 extended, 4 free) #p primary partition
e extended #e extended partition
Select (default p): p
Partition number (1-4, default 1): # partition number
Starting sector (2048-41943039, the default is 2048): the start sector number #
We will use the default value 2048
Last sector, sector + or + size {K, M, G} (2048-41943039, defaults to 41943039): + 2G # partition size
Partition 1 is set to Linux type, size to 2 GiB
Command (input m to get help): p #n create partitions
Disk /dev/sdb:21.5 GB, 21474836480 bytes, 41943040 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical / physical): 512 byte / 512 byte
I / O Size (minimal / optimal): 512 byte / 512 byte
Disk Label Type: dos
Disk identifier: 0x8b6742b9
设备 Boot Start End Blocks Id System
/dev/sdb1 2048 4196351 2097152 83 Linux
Command (input m to get help): n
Partition type:
p primary (1 primary, 0 extended, 3 free)
e extended
Select (default p): p
Partition number (2-4, default 2):
Starting sector (4196352-41943039, default 4,196,352):
We will use the default value 4,196,352
Last sector, sector + or + size {K, M, G} (4196352-41943039, defaults to 41943039): + 3G
Zone 2 is set to Linux type, size is set to 3 GiB
Command (input m to get help): p
Disk /dev/sdb:21.5 GB, 21474836480 bytes, 41943040 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical / physical): 512 byte / 512 byte
I / O Size (minimal / optimal): 512 byte / 512 byte
Disk Label Type: dos
Disk identifier: 0x8b6742b9
设备 Boot Start End Blocks Id System
/dev/sdb1 2048 4196351 2097152 83 Linux
/dev/sdb2 4196352 10487807 3145728 83 Linux
Command (input m to get help): n
Partition type:
p primary (2 primary, 0 extended, 2 free)
e extended
Select (default p): e
Partition number (3,4, 3 by default):
Starting sector (10487808-41943039, default 10487808):
We will use the default value 10,487,808
Last sector, sector + or + size {K, M, G} (10487808-41943039, default 41943039):
We will use the default value 41,943,039
Extended partition 3 is set to the type, size to 15 GiB
Command (input m to get help): p
Disk /dev/sdb:21.5 GB, 21474836480 bytes, 41943040 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical / physical): 512 byte / 512 byte
I / O Size (minimal / optimal): 512 byte / 512 byte
Disk Label Type: dos
Disk identifier: 0x8b6742b9
设备 Boot Start End Blocks Id System
/dev/sdb1 2048 4196351 2097152 83 Linux
/dev/sdb2 4196352 10487807 3145728 83 Linux
/dev/sdb3 10487808 41943039 15727616 5 Extended
Command (input m to get help): n
Partition type:
p primary (2 primary, 1 extended, 1 free)
l logical (numbered from 5)
Select (default p): l
Add a logical partition 5
Starting sector (10489856-41943039, default 10489856):
We will use the default value 10,489,856
Last sector, sector + or + size {K, M, G} (10489856-41943039, defaults to 41943039): + 5G
5 Linux partition has been set to the type, size to 5 GiB
Command (input m to get help): p
Disk /dev/sdb:21.5 GB, 21474836480 bytes, 41943040 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical / physical): 512 byte / 512 byte
I / O Size (minimal / optimal): 512 byte / 512 byte
Disk Label Type: dos
Disk identifier: 0x8b6742b9
设备 Boot Start End Blocks Id System
/dev/sdb1 2048 4196351 2097152 83 Linux
/dev/sdb2 4196352 10487807 3145728 83 Linux
/dev/sdb3 10487808 41943039 15727616 5 Extended
/dev/sdb5 10489856 20975615 5242880 83 Linux
Command (input m to get help): d #d delete partition
Partition number (1-3, 5, default 5): 1 # to delete the partition number
Deleted Partition 1
Command (input m to get help): p
Disk /dev/sdb:21.5 GB, 21474836480 bytes, 41943040 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical / physical): 512 byte / 512 byte
I / O Size (minimal / optimal): 512 byte / 512 byte
Disk Label Type: dos
Disk identifier: 0x8b6742b9
设备 Boot Start End Blocks Id System
/dev/sdb2 4196352 10487807 3145728 83 Linux
/dev/sdb3 10487808 41943039 15727616 5 Extended
/dev/sdb5 10489856 20975615 5242880 83 Linux
Command (input m to get help): w # Save and Exit
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
[Root @ localhost /] # fidsk -l / dev / sdb # view the partition information / dev / sdb of
-bash: fidsk: command not found
[root@localhost /]# fdisk -l /dev/sdb
Disk /dev/sdb:21.5 GB, 21474836480 bytes, 41943040 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical / physical): 512 byte / 512 byte
I / O Size (minimal / optimal): 512 byte / 512 byte
Disk Label Type: dos
Disk identifier: 0x8b6742b9
设备 Boot Start End Blocks Id System
/dev/sdb2 4196352 10487807 3145728 83 Linux
/dev/sdb3 10487808 41943039 15727616 5 Extended
/dev/sdb5 10489856 20975615 5242880 83 Linux
5, summary
1) fdisk command applies to 2TB disk partition management;
2) fdisk -l to see all disks, partitions;
3) fdisk command operations: ①, m view help information; ②, p view partition information; ③, n create a partition (p main branch, e extended partition, l logical partition); ④, d delete partitions; ⑤, q is not saved exit; ⑥, w save and exit; ⑦, t convert the partition type.