sfdisk — display or manipulate a disk partition table
sfdisk [options] device [
sfdisk is a script-oriented tool for partitioning any block device.
Since version 2.26 sfdisk supports MBR (DOS), GPT, SUN and SGI disk labels, but no longer provides any functionality for CHS (Cylinder-Head-Sector) addressing. CHS has never been important for Linux, and this addressing concept does not make any sense for new devices.
sfdisk (since version 2.26) aligns the start and end of partitions to block-device I/O limits when relative sizes are specified, or when the default values are used.
sfdisk does not create the standard system partitions for SGI and SUN disk labels like fdisk(8) does. It is necessary to explicitly create all partitions including whole-disk system partitions.
The commands are mutually exclusive.
The default sfdisk command is to
read the specification for the desired partitioning of
standard input, and then create a partition table
according to the specification. See below for the
description of the input format. If standard input is a
terminal, then sfdisk starts an
If the option
is specified, then the changes are applied to the
partition addressed by
unspecified fields of the partition are not
Note that it's possible to address an unused
For example, an MBR always contains 4 partitions, but
the number of used partitions may be smaller. In this
case sfdisk follows the
default values from the partition table and does not
use built-in defaults for the unused partition given
−N. See also
Switch on the bootable flag for the specified
partitions. If no
specified, then list the partitions with an enabled
Delete all or the specified partitions.
Dump the partitions of a device in a format that is usable as input to sfdisk. See the section BACKING UP THE PARTITION TABLE.
−g, −−show−geometry [
List the geometry of all or the specified devices.
Dump the partitions of a device in JSON format. Note that sfdisk is not able to use JSON as input format.
−l, −−list [
List the partitions of all or the specified devices.
This command can be used together with
−F, −−list−free [
List the free unpartitioned areas on all or the specified devices.
Change the GPT partition attribute bits. If attributes is not specified, then print the current partition settings. The attributes argument is a comma- or space-delimited list of bits. The currently supported attribute bits are: RequiredPartiton, NoBlockIOProtocol, LegacyBIOSBootable and GUID-specific bits in the range from 48 to 63. For example, the string "RequiredPartiton,50,51" sets three bits.
Change the GPT partition name (label). If label is not specified, then print the current partition label.
Change the partition type. If type is not
specified, then print the current partition type. The
argument is hexadecimal for MBR, or a GUID for GPT. For
backward compatibility the options
−−id have the same meaning
as this one.
Change the GPT partition UUID. If uuid is not specified, then print the current partition UUID.
Renumber the partitions, ordering them by their start offset.
−s, −−show−size [
List the sizes of all or the specified devices.
Print all supported types for the current disk label
or the label specified by
−V, −−verify [
Test whether the partition table and partitions seem correct.
Don't create a new partition table, but only append the specified partitions.
Back up the current partition table sectors before
starting the partitioning. The default backup file name
is ~/sfdisk-<device>-<offset>.bak; to use
another name see option
Colorize the output. The optional argument
If the when argument is
omitted, it defaults to auto. The colors can
be disabled; for the current built-in default see the
See also the
Disable all consistency checking.
Deprecated and ignored option. Partitioning that is compatible with Linux (and other modern operating systems) is the default.
Do everything except writing to the device.
Do not check through the re-read-partition-table ioctl whether the device is in use.
Override the default backup file name. Note that the device name and offset are always appended to the file name.
Move data after partition relocation, for example
when moving the beginning of a partition to another
place on the disk. The size of the partition has to
remain the same, the new and old location may overlap.
This option requires option
−N in order to be processed on
one specific partition only.
The path overrides the default log file name (the default is ~/sfdisk-<devname>.move). The log file contains information about all read/write operations on the partition data.
Note that this operation is risky and not atomic. Don't forget to backup your data!
In the example below, the first command creates a 100MiB free area before the first partition and moves the data it contains (e.g. a filesystem), the next command creates a new partition from the free space (at offset 2048), and the last command reorders partitions to match disk order (the original sdc1 will become sdc2).
echo '+100M,' | sfdisk --move-data /dev/sdc -N 1 echo '2048,' | sfdisk /dev/sdc --append sfdisk /dev/sdc --reorder
Specify which output columns to print. Use
−−help to get a
list of all supported columns.
The default list of columns may be extended if
specified in the format
Suppress extra info messages.
−u, −−unit S
Deprecated option. Only the sector unit is supported.
Specify the disk label type (e.g. dos, gpt, ...). If this option is not given, then sfdisk defaults to the existing label, but if there is no label on the device yet, then the type defaults to dos.
Force editing of a nested disk label. The primary disk label has to exist already. This option allows to edit for example a hybrid/protective MBR on devices with GPT.
Wipe filesystem, RAID and partition-table signatures from the device, in order to avoid possible collisions. The argument when can be auto, never or always. When this option is not given, the default is auto, in which case signatures are wiped only when in interactive mode. In all cases detected signatures are reported by warning messages before a new partition table is created. See also wipefs(8) command.
Display version information and exit.
Display help text and exit.
sfdisk supports two input formats and generic header lines.
The optional header lines specify generic information that apply to the partition table. The header-line format is:<name>: <value>
The currently recognized headers are:
Specify the partitioning unit. The only supported unit is sectors.
Specify the partition table type. For example dos or gpt.
Specify the partition table identifier. It should be a hexadecimal number (with a 0x prefix) for MBR and a UUID for GPT.
Note that it is only possible to use header lines before the first partition is specified in the input.
start size type bootable
where each line fills one partition descriptor.
Fields are separated by whitespace, comma or semicolon possibly followed by whitespace; initial and trailing whitespace is ignored. Numbers can be octal, decimal or hexadecimal; decimal is the default. When a field is absent, empty or specified as '-' a default value is used. But when the
−Noption (change a single partition) is given, the default for each field is its previous value.
The default value of start is the first non-assigned sector aligned according to device I/O limits. The default start offset for the first partition is 1 MiB. The offset may be followed by the multiplicative suffixes (KiB, MiB, GiB, TiB, PiB, EiB, ZiB and YiB) then the number is interpreted as offset in bytes.
The default value of size indicates "as much as possible"; i.e. until the next partition or end-of-device. A numerical argument is by default interpreted as a number of sectors, however if the size is followed by one of the multiplicative suffixes (KiB, MiB, GiB, TiB, PiB, EiB, ZiB and YiB) then the number is interpreted as the size of the partition in bytes and it is then aligned according to the device I/O limits. A '+' can be used instead of a number to enlarge the partition as much as possible. Note '+' is equivalent to the default behaviour for a new partition; existing partitions will be resized as required.
The partition type is given in hex for MBR (DOS), without the 0x prefix, a GUID string for GPT, or a shortcut:
Linux; means 83 for MBR and 0FC63DAF-8483-4772-8E79-3D69D8477DE4 for GPT.
swap area; means 82 for MBR and 0657FD6D-A4AB-43C4-84E5-0933C84B4F4F for GPT
extended partition; means 5 for MBR
home partition; means 933AC7E1-2EB4-4F13-B844-0E14E2AEF915 for GPT
linux extended partition; means 85 for MBR.
EFI System partition, means EF for MBR and C12A7328-F81F-11D2-BA4B-00A0C93EC93B for GPT
The default type value is
bootable is specified as [
*|-], with as default not-bootable. The value of this field is irrelevant for Linux - when Linux runs it has been booted already - but ir might play a role for certain boot loaders and for other operating systems.
This format is more readable, robust, extendible and allows to specify additional information (e.g. a UUID). It is recommended to use this format to keep your scripts more readable.[device
devicefield is optional. sfdisk extracts the partition number from the device name. It allows to specify the partitions in random order. This functionality is mostly used by
−−dump. Don't use it if you are not sure.
The value can be between quotation marks (e.g. name="This is partition name"). The currently supported fields are:
The first non-assigned sector aligned according to device I/O limits. The default start offset for the first partition is 1 MiB. The offset may be followed by the multiplicative suffixes (KiB, MiB, GiB, TiB, PiB, EiB, ZiB and YiB) then the number is interpreted as offset in bytes.
Specify the partition size in sectors. The number may be followed by the multiplicative suffixes (KiB, MiB, GiB, TiB, PiB, EiB, ZiB and YiB), then it's interpreted as size in bytes and the size is aligned according to device I/O limits.
Mark the partition as bootable.
Partition attributes, usually GPT partition attribute bits. See
−−part−attrsfor more details about the GPT-bits string format.
GPT partition UUID.
GPT partition name.
A hexadecimal number (without 0x) for an MBR partition, or a GUID for a GPT partition. For backward compatibility the
Id=field has the same meaning.
It is recommended to save the layout of your devices. sfdisk supports two ways.
option to save a description of the device layout to a text
file. The dump format is suitable for later sfdisk input. For
sfdisk --dump /dev/sda > sda.dump
This can later be restored by:
sfdisk /dev/sda < sda.dump
If you want to do a full (binary) backup of all sectors
where the partition table is stored, then use the
−−backup option. It
writes the sectors to
~/sfdisk-<device>-<offset>.bak files. The default
name of the backup file can be changed with the
−−backup−file option. The
backup files contain only raw data from the
device. Note that the same
concept of backup files is used by wipefs(8). For example:
sfdisk --backup /dev/sda
The GPT header can later be restored by:
dd if=~/sfdisk-sda-0x00000200.bak of=/dev/sda \ seek=$((0x00000200)) bs=1 conv=notrunc
Note that sfdisk since version 2.26
no longer provides the
option to restore sectors. dd
(1) provides all necessary functionality.
Implicit coloring can be disabled by an empty file
See terminal-colors.d(5) for more details about colorization configuration. The logical color names supported by sfdisk are:
The header of the output tables.
The warning messages.
The welcome message.
Since version 2.26 sfdisk no longer provides
−−re−read option to force
the kernel to reread the partition table. Use blockdev −−rereadpt
Since version 2.26 sfdisk does not provide the
enables sfdisk debug output.
enables libfdisk debug output.
enables libblkid debug output.
enables libsmartcols debug output.
Karel Zak <firstname.lastname@example.org>
The current sfdisk implementation is based on the original sfdisk from Andries E. Brouwer.
The sfdisk command is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/.
sfdisk.8 -- man page for sfdisk
Copyright (C) 2014 Karel Zak <kzakredhat.com>
Permission is granted to make and distribute verbatim copies of this
manual provided the copyright notice and this permission notice are
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Permission is granted to copy and distribute modified versions of this
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