DiskPart Command-Line Options

Article
07/25/2008

DiskPart is a text-mode command interpreter in Windows Vista, Windows® XP, and the Windows Server 2003® family. This tool enables you to manage objects (disks, partitions, or volumes) by using scripts or direct input at a command prompt.

DiskPart Commands

Before you can use DiskPart commands on a disk, partition, or volume, you must first list and then select the object to give it focus. When an object has focus, any DiskPart commands that you type act on that object.

You can list the available objects and determine an object's number or drive letter by using the list disk, list volume, and list partition commands. The list disk and list volume commands display all disks and volumes on the computer. However, the list partition command displays only partitions on the disk that have focus. When you use the list commands, an asterisk (*) appears next to the object with focus. You select an object by its number or drive letter, such as disk 0, partition 1, volume 3, or volume C.

When you select an object, the focus remains on that object until you select a different object. For example, if the focus is set on disk 0, and you select volume 8 as on disk 2, the focus shifts from disk 0 to disk 2, volume 8. Some commands automatically change the focus. For example, when you create a new partition, the focus automatically changes to the new partition.

You can give focus only to a partition on the selected disk. When a partition has focus, the related volume (if any) also has focus. When a volume has focus, the related disk and partition also have focus if the volume maps to a single specific partition. If this is not the case, then focus on the disk and partition is lost.

Important

When using the DiskPart command as a part of a script, it is recommended that you complete all of the DiskPart operations together as part of a single DiskPart script. You can run consecutive DiskPart scripts, but you must allow at least 15 seconds between each script for a complete shutdown of the previous execution before running the DiskPart command again in successive scripts. Otherwise, the successive scripts might fail. You can add a pause between consecutive DiskPart scripts by adding the timeout /t 15 command to your batch file along with your DiskPart scripts.

For more information about DiskPart, see Disk Management at the Microsoft TechNet Web site.

DiskPart Syntax and Parameters

This table identifies the syntax and parameters of the DiskPart commands.

Command Syntax Description

active

On basic disks, marks the partition with focus as active. This informs the basic input/output system (BIOS) or Extensible Firmware Interface (EFI) that the partition or volume is a valid system partition or system volume.

Only partitions can be marked as "active."

Important
DiskPart verifies that only the partition is capable of containing an operating system's startup files. DiskPart does not check the contents of the partition. If you mark a partition as "active" and it does not contain the operating system's startup files, your computer might not start.

add disk

add disk=n [noerr]

Mirrors the simple volume with focus to the specified disk. This command is not valid on Windows Vista.

Specifies the disk to contain the mirror. You can mirror only simple volumes. The specified disk must have unallocated space at least as large as the size of the simple volume that you intend to mirror.

noerr

For scripting only. When an error is encountered, specifies that DiskPart continues to process commands as if the error did not occur. Without the noerr parameter, an error causes DiskPart to exit with an error code.

assign

assign [{letter=d|mount=path}] [noerr]

Assigns a drive letter or mount point to the volume with focus. If no drive letter or mount point is specified, then the next available drive letter is assigned. If the assigned drive letter or mount point is already in use, an error is generated.

By using the assign command, you can change the drive letter associated with a removable drive.

You cannot assign drive letters to system volumes, boot volumes, or volumes that contain the paging file. You cannot assign a drive letter to an OEM partition or any GPT partition other than a basic data partition.

letter=d

Specifies the drive letter that you intend to assign to the volume.

mount=path

Specifies the mount point path that you intend to assign to the volume.

noerr

attributes

attributes volume [{set | clear}] [{hidden | readonly | nodefaultdriveletter | shadowcopy}] [noerr]

volume

Displays the attributes of the selected volume.

set

Sets the specified attribute (hidden, read-only, nodefaultdriveletter, or shadowcopy volume) on the selected volume.

clear

Clears the specified attribute (hidden, read-only, nodefaultdriveletter, or shadowcopy volume) from the selected volume.

hidden

Specifies that the volume is hidden.

readonly

Specifies that the volume is read-only.

nodefaultdriveletter

Specifies that the volume does not receive a drive letter by default.

shadowcopy

Specifies that the volume is a shadow copy volume.

noerr

For scripting only. When an error is encountered, DiskPart continues to process commands as if the error did not occur. Without the noerr parameter, an error causes DiskPart to exit with an error code.

automount

automount [enable] [disable] [scrub] [noerr]

When enabled (the default), Windows automatically mounts the file system for a new basic volume when it is added to the system, and then assigns a drive letter to the volume. In system area network configurations, disabling automount prevents Windows from automatically mounting or assigning drive letters to any new basic volumes added to the system.

enable

Enables Windows to automatically mount new basic volumes added to the system and to assign them drive letters.

disable

Prevents Windows from automatically mounting any new basic volumes that are added to the system.

scrub

Removes volume mount point directories and registry settings for volumes that are no longer in the system. This prevents volumes that were previously in the system from being automatically mounted and given their former volume mount point(s) when they are added back to the system.

noerr

break disk

break disk=n [nokeep] [noerr]

Applies to dynamic disks only. Breaks the mirrored volume with focus into two simple volumes. One simple volume retains the drive letter and any mount points of the mirrored volume, while the other simple volume receives the focus so that you can assign it a drive letter.

By default, the contents of both halves of the mirror are retained; each half becomes a simple volume. If you use the nokeep parameter, only one-half of the mirror is retained as a simple volume, while the other half is deleted and converted to free space. Neither volume receives the focus.

Specifies the disk that contains the mirrored volume.

nokeep

Specifies that only one of the mirrored volumes is retained; the other simple volume is deleted and converted to free space. Neither volume receives the focus.

noerr

clean

clean [all]

Removes any and all partition or volume formatting from the disk with focus. On master boot record (MBR) disks, only the MBR partitioning information and hidden sector information are overwritten. On GUID partition table (GPT) disks, the GPT partitioning information, including the Protective MBR, is overwritten; there is no hidden sector information.

all

Specifies that each and every sector on the disk is zeroed, which completely deletes all data contained on the disk.

convert basic

convert basic [noerr]

Converts an empty dynamic disk into a basic disk.

Important

The disk must be empty to convert it to a basic disk. Back up your data, and then delete all partitions or volumes before converting the disk.

noerr

convert dynamic

convert dynamic [noerr]

Converts a basic disk into a dynamic disk. Any existing partitions on the disk become simple volumes.

noerr

convert gpt

convert gpt [noerr]

On Itanium-based computers, converts an empty basic disk with the master boot record (MBR) partition style into a basic disk with the GUID partition table (GPT) partition style.

Important

The disk must be empty to convert it to a GPT disk. Back up your data and then delete all partitions or volumes before converting the disk.

noerr

convert mbr

convert mbr [noerr]

On Itanium-based computers, converts an empty basic disk with the GUID Partition Table (GPT) partition style to a basic disk with the master boot record (MBR) partition style.

Important

The disk must be empty to convert it to an MBR disk. Back up your data and then delete all partitions or volumes before converting the disk.

noerr

create partition efi

create partition efi [size=n] [offset=n] [noerr]

On Itanium-based computers, creates an Extensible Firmware Interface (EFI) system partition on a GUID Partition Table (GPT) disk. After the partition has been created, the focus is given to the new partition.

size=n

Specifies the size of the partition in megabytes (MB). If no size is given, the partition continues until there is no more free space in the current region.

offset=n

Specifies the byte offset at which to create the partition. If no offset is given, the partition is placed in the first disk extent that is large enough to hold it.

noerr

create partition extended

create partition extended [size=n] [offset=n] [noerr]

Creates an extended partition on the current drive. After the partition has been created, the focus automatically shifts to the new partition. Only one extended partition can be created per disk. This command fails if you attempt to create an extended partition within another extended partition. You must create an extended partition before you can create logical drives.

size=n

Specifies the size of the extended partition in megabytes (MB). If no size is given, then the partition continues until there is no more free space in the region. The size is cylinder snapped; that is, the size is rounded to the closest cylinder boundary. For example, if you specify a size of 500 MB, the partition size rounds up to 504 MB.

offset=n

Applies to master boot record (MBR) disks only. Specifies the byte offset at which to create the extended partition. If no offset is given, the partition starts at the beginning of the first free space on the disk. The offset is cylinder snapped; that is, the offset is rounded to the closest cylinder boundary. For example, if you specify an offset that is 27 MB and the cylinder size is 8 MB, the offset is rounded to the 24-MB boundary.

noerr

create partition logical

create partition logical [size=n] [offset=n] [noerr]

Creates a logical drive in the extended partition. After the partition has been created, the focus automatically shifts to the new logical drive.

size=n

The size of the logical drive in megabytes (MB). If no size is given, then the partition continues until there is no more free space in the current region.

offset=n

Applies to master boot record (MBR) disks only. Specifies the byte offset at which to create the logical drive. The offset is cylinder snapped; that is, the offset rounds up to completely fill whatever cylinder size is used. If no offset is given, then the partition is placed in the first disk extent that is large enough to hold it. The partition is at least as long in bytes as the number specified by size=n. If you specify a size for the logical drive, it must be smaller than the extended partition.

noerr

create partition msr

create partition msr [size=n] [offset=n] [noerr]

On Itanium-based computers, creates a Microsoft reserved (MSR) partition on a GUID Partition Table (GPT) disk.

Warning

Be very careful when using the create partition msr command. GPT disks require a specific partition layout, and so creating Microsoft Reserved Partitions can cause the disk to become unreadable. On GPT disks that are used to start Windows XP 64-Bit Edition or the 64-bit versions of the Windows Server 2003 family, the EFI system partition is the first partition on the disk, followed by the Microsoft Reserved Partition. GPT disks used only for data storage do not have an EFI system partition; the Microsoft Reserved Partition is the first partition.

Windows XP and the Windows Server 2003 family do not mount Microsoft Reserved Partitions. You cannot store data on them and you cannot delete them.

size=n

Specifies the size of the partition in megabytes (MB). The partition is at least as long in bytes as the number specified by size=n. If no size is given, the partition continues until there is no more free space in the current region.

offset=n

Specifies the byte offset at which to create the partition. The partition starts at the byte offset specified by offset=n. It is sector-snapped; that is, the offset rounds up to completely fill whatever sector size is used. If no offset is given, then the partition is placed in the first disk extent that is large enough to hold it.

noerr

create partition primary

create partition primary [size=n] [offset=n] [ID={byte|GUID}] [align=n][noerr]

Creates a primary partition on the current basic disk. After you create the partition, the focus automatically shifts to the new partition. The partition does not receive a drive letter; you must use the assign command to assign a drive letter to the partition.

size=n

Specifies the size of the partition in megabytes (MB). If no size is given, the partition continues until there is no more unallocated space in the current region. The size is cylinder snapped; that is, the size rounds to the closest cylinder boundary. For example, if you specify a size of 500 MB, the partition size rounds up to 504 MB.

offset=n

Specifies the byte offset at which to create the partition. If no offset is given, the partition starts at the beginning of the first free space on the disk. For master boot record (MBR) disks, the offset is cylinder snapped; that is, the offset rounds to the closest cylinder boundary. For example, if you specify an offset that is 27 MB and the cylinder size is 8 MB, the offset rounds to the 24-MB boundary.

ID={byte|GUID}

Intended for OEM use only.

Warning

Creating partitions with this parameter might cause your computer to crash or be unable to start. Unless you are an OEM or an IT professional experienced with GPT disks, do not create partitions on GPT disks by using the ID=byte | GUID parameter. Instead, always use the create partition efi command to create EFI system partitions, the create partition msr command to create Microsoft Reserved Partitions, and the create partition primary command (without the ID=byte | GUID parameter) to create primary partitions on GPT disks.

align= n

Typically used with hardware RAID Logical Unit Number (LUN) arrays to improve performance when the logical units (LUs) are not cylinder aligned. Aligns a primary partition that is not cylinder aligned at the beginning of a disk and rounds the offset to the closest alignment boundary, where n is the number of kilobytes (KB) from the beginning of the disk to the closest alignment boundary. The align= n command fails if the primary partition is not at the beginning of the disk. If used with offset= n, the offset is within the first usable cylinder on the disk.

noerr

Comments

To partition a GPT disk with an OEM partition generate an OEM-GUID:

Use this command to create an EFI partition:

create partition efi size=n

Use this command to create a primary partition:

create partition primary size=n ID={byte|GUID}

Use this command to create an MSR partition:

create partition MSR size=n

Important

You must create the OEM partition between the EFI and MSR partitions.

Never create the LDM metadata or LDM data partitions explicitly as partitions. Instead, convert the disk to dynamic.

For master boot record (MBR) disks, you can specify a partition type byte, in hexadecimal form, for the partition. If you do not specify a partition type byte on an MBR disk, the create partition primary command creates a partition of type 0x6. Any partition type byte can be specified with the ID=byte | GUID parameter. DiskPart does not verify the validity of the partition type nor does it verify the ID parameter.

For GPT disks, you can specify a partition type GUID for the partition that you create.
EFI system partition: c12a7328-f81f-11d2-ba4b-00a0c93ec93b
Microsoft reserved partition: e3c9e316-0b5c-4db8-817d-f92df00215ae
Basic data partition: ebd0a0a2-b9e5-4433-87c0-68b6b72699c7
LDM metadata partition on a dynamic disk: 5808c8aa-7e8f-42e0-85d2-e1e90434cfb3
LDM data partition on a dynamic disk: af9b60a0-1431-4f62-bc68-3311714a69ad

If you do not specify a partition type GUID, the create partition primary command creates a basic data partition. Any partition type can be specified with the ID=byte | GUID parameter. DiskPart does not verify the validity of the partition GUID nor does it verify the ID parameter.

create volume raid

create volume raid [size=n] [disk=n,n,n[,n,…]] [noerr]

Creates a RAID-5 volume on three or more specified dynamic disks. After you create the volume, the focus automatically shifts to the new volume. This command is not valid on Windows Vista.

size=n

Specifies the amount of disk space, in megabytes (MB), that the volume occupies on each disk. If no size is given, the largest possible RAID-5 volume is created. The disk with the smallest available contiguous free space determines the size for the RAID-5 volume and the same amount of space is allocated from each disk. The actual amount of usable disk space in the RAID-5 volume is less than the combined amount of disk space because some of the disk space is required for parity.

disk=n,n,n[,n,…]

Specifies the dynamic disks on which to create the volume. You need at least three dynamic disks in order to create a RAID-5 volume. An amount of space equal to size=n is allocated on each disk.

noerr

create volume simple

create volume simple [size=n] [disk=n] [noerr]

Creates a simple volume. After you create the volume, the focus automatically shifts to the new volume. Dynamic disks are not supported on Windows Vista Starter, Windows Vista Home Basic, Windows Vista Home N, and Windows Vista Business operating systems.

size=n

Specifies the size of the volume in megabytes (MB). If no size is given, the new volume takes up the remaining free space on the disk.

disk=n

Specifies the dynamic disk on which to create the volume. If no disk is given, the current disk is used.

noerr

create volume stripe

create volume stripe [size=n] [disk=n,n[,n,…]] [noerr]

Creates a striped volume by using two or more specified dynamic disks. After you create the volume, the focus automatically shifts to the new volume. Dynamic disks are not supported on Windows Vista Starter, Windows Vista Home Basic, Windows Vista Home N, and Windows Vista Business operating systems.

size=n

Specifies the amount of disk space, in megabytes (MB), that the volume occupies on each disk. If no size is given, the new volume takes up the remaining free space on the smallest disk and an equal amount of space on each subsequent disk.

disk=n,n[,n,…]

Specifies the dynamic disks on which to create the volume. You need at least two dynamic disks to create a striped volume. An amount of space equal to size=n is allocated on each disk.

noerr

delete disk

delete disk [noerr] [override]

Deletes a missing dynamic disk from the disk list.

noerr

override

Enables DiskPart to delete all simple volumes on the disk. If the disk contains half of a mirrored volume, the half of the mirror on the disk is deleted. The delete disk override command fails if the disk is a member of a RAID-5 volume.

delete partition

delete partition [noerr] [override]

On a basic disk, deletes the partition with focus. You cannot delete the system partition, boot partition, or any partition that contains the active paging file or crash dump (memory dump).

Warning

Deleting a partition on a dynamic disk can delete all dynamic volumes on the disk, thus destroying any data and leaving the disk in a corrupted state. To delete a dynamic volume, always use the delete volume command instead.

You can delete partitions from dynamic disks, but you must not create them. For example, it is possible to delete an unrecognized GUID Partition Table (GPT) partition on a dynamic GPT disk. However, deleting such a partition does not cause the resulting free space to become available. This command is intended to enable space reclamation on a corrupted, offline dynamic disk in an emergency situation where the clean command cannot be used.

noerr

For scripting only. When an error occurs, specifies that DiskPart continues to process commands as if the error did not occur. Without the noerr parameter, an error causes DiskPart to exit with an error code.

override

Enables DiskPart to delete any partition regardless of type. Normally, DiskPart enables you to delete only known data partitions.

delete volume

delete volume [noerr]

Deletes the selected volume. You cannot delete the system volume, boot volume, or any volume that contains the active paging file or crash dump (memory dump).

noerr

detail disk

Displays the properties of the selected disk and the volumes on that disk.

detail partition

Displays the properties of the selected partition.

detail volume

Displays the disks on which the current volume resides.

exit

Exits the DiskPart command interpreter.

extend

extend [size=n] [disk=n] [noerr]

Extends the volume with focus into the next contiguous unallocated space. For basic volumes, the unallocated space must be on the same disk as, and must follow (have a higher sector offset number than) the partition with focus. A dynamic, simple, or spanned volume can be extended to any empty space on any dynamic disk. By using this command, you can extend an existing volume into newly created space.

If the partition was previously formatted with the NTFS file system, the file system is automatically extended to occupy the larger partition. No data loss occurs. If the partition was previously formatted with any file system format other than NTFS, the command fails with no change to the partition.

You cannot extend the current system or boot partitions.

size=n

Specifies the amount of space, in megabytes (MB), to add to the current partition. If you do not specify a size, the disk is extended to take up all of the next contiguous unallocated space.

disk=n

Specifies the dynamic disk on which to extend the volume. An amount of space equal to size=n is allocated on the disk. If no disk is specified, the volume is extended on the current disk.

noerr

filesystems

Displays current and supported file systems on the volume. A volume must be selected for this operation to succeed.

format

format [{[FS=<FS>] [REVISION=<X.XX>] | RECOMMENDED}] [LABEL=<"label">] [UNIT=<N>] [QUICK] [COMPRESS] [OVERRIDE] [NOWAIT] [NOERR]

Formats the volume or partition. A volume must be selected for this operation to succeed.

FS=<FS>

Specifies the type of file system. If no file system is given, the default file system displayed by the FILESYSTEMS command is used.

REVISION = <X.XX>

Specifies the file system revision (if applicable).

RECOMMENDED

If specified, use the recommended file system and revision instead of the default if a recommendation exists. The recommended file system (if one exists) is displayed by the FILESYSTEMS command.

LABEL=<"label">

Specifies the volume label.

UNIT=<N>

Overrides the default allocation unit size. Default settings are strongly recommended for general use. The default allocation unit size for a particular file system is displayed by the FILESYSTEMS command.

NTFS compression is not supported for allocation unit sizes above 4096.

QUICK

Performs a quick format.

COMPRESS

NTFS only: Files created on the new volume will be compressed by default.

OVERRIDE

Forces the volume to dismount first if necessary. All opened handles to the volume would no longer be valid.

NOWAIT

Forces the command to return immediately while the format process is still in progress. If NOWAIT is not specified, DiskPart will display format progress in percentage.

NOERR

For scripting only. When an error is encountered, DiskPart continues to process commands as if the error did not occur. Without the NOERR parameter, an error causes DiskPart to exit with an error code.

Examples:

FORMAT FS=NTFS LABEL="New Volume" QUICK COMPRESS

FORMAT RECOMMENDED OVERRIDE

gpt attributes

gpt attributes= n

On basic GPT disks, assigns the GPT attribute(s) to the partition with focus. GPT partition attributes give additional information about the use of the partition. Some attributes are specific to the partition type GUID.

Important

Changing the GPT attributes might cause your basic data volumes to be unmountable or fail to be assigned drive letters. Unless you are an OEM or an IT professional experienced with GPT disks, do not change GPT attributes.

The hexadecimal that pertains to the attribute that you intend to apply to the partition with focus. The GPT attribute field is a 64-bit field that contains two subfields. The higher field is interpreted only in the context of the partition ID, while the lower field is common to all partition IDs.

All partitions have the following attribute:

0x000000000000001 marks the partition as required. This indicates to all disk management utilities that the partition must not be deleted. The EFI system partition contains only those binaries necessary to start the operating system. This makes it easy for OEM- or operating system-specific binaries to be placed in other partitions.

For basic data partitions, the following attribute is defined:

0x8000000000000000 prevents the partition from having a drive letter automatically assigned. By default, each partition is assigned a new drive letter. Setting this attribute ensures that, when a disk is moved to a new computer, a new drive letter will not be automatically generated. Instead, the user can manually assign drive letters.

Note

Other attributes can be added at any time.

help

Displays a list of the available commands.

import

import [noerr]

Imports a foreign disk group into the local computer's disk group. The import command imports every disk that is in the same group as the disk that has focus.

noerr

inactive

On basic master boot record (MBR) disks, marks the system partition or boot partition with focus as inactive. The computer starts from the next option specified in the BIOS such as the CD-ROM drive or a Pre-Boot eXecution Environment (PXE)-based boot environment (such as Remote Installation Services (RIS)) when you restart the computer.

Warning

Your computer might not start without an active partition. Do not mark a system or boot partition as inactive unless you are an experienced user with a thorough understanding of the Windows Server 2003 family.

If you are unable to start your computer after marking the system or boot partition as inactive, insert the Setup CD in the CD-ROM drive, restart the computer, and then repair the partition by using the Fixmbr and Fixboot commands in the Recovery Console.

list disk

Displays a list of disks and information about them, such as their size, amount of available free space, whether the disk is a basic or dynamic disk, and whether the disk uses the master boot record (MBR) or GUID partition table (GPT) partition style. The disk marked with an asterisk (*) has focus.

list partition

Displays the partitions listed in the partition table of the current disk. On dynamic disks, these partitions may not correspond to the dynamic volumes on the disk. This discrepancy occurs because dynamic disks contain entries in the partition table for the system volume or boot volume (if present on the disk). Dynamic disks also contain a partition that occupies the remainder of the disk and reserves space for use by dynamic volumes.

list volume

Displays a list of basic and dynamic volumes on all disks.

online

online [noerr]

Brings an offline disk or volume with focus online. Resynchronizes the mirrored or RAID-5 volume with focus.

noerr

rem

Provides a way to add comments to a script. For example:

rem These commands set up 3 drives.
create partition primary size=2048
assign d:
create partition extend
create partition logical size=2048
assign e:
create partition logical
assign f:

remove

remove [{letter=d|mount=path|[all]}] [dismount][noerr]

Removes a drive letter or mount point from the volume with focus. If the all parameter is used, all current drive letters and mount points are removed. If you do not specify a drive letter or mount point, then DiskPart removes the first drive letter or mount point that it encounters.

You can use the remove command to change the drive letter associated with a removable drive. You cannot remove the drive letters on system, boot, or paging volumes. In addition, you cannot remove the drive letter for an OEM partition, any GPT partition with an unrecognized GUID, or any of the special, non-data, GPT partitions such as the EFI system partition.

letter=d

Specifies the drive letter to remove.

mount=path

Specifies the mount point path to remove.

all

Removes all current drive letters and mount points.

dismount

Dismounts the basic volume, when all drive letters and mount points have been removed from the volume, and takes the basic volume offline, making it unmountable. If other processes are using the volume, DiskPart closes any open handles before dismounting the volume. You can make the volume mountable by assigning it a drive letter or by creating a mount point path to the volume. Dismount will fail if used on a volume that has any remaining drive letters or mount points. For scripting, using removeall dismount is recommended.

noerr

repair disk

repair disk=n [noerr]

Repairs the RAID-5 volume with focus by replacing the failed RAID-5 member with the specified dynamic disk. The specified dynamic disk must have free space greater than or equal to the total size of the failed RAID-5 member.

Specifies the dynamic disk that replaces the failed RAID-5 member. The specified disk must have free space equal to or larger than the total size of the failed RAID-5 member.

noerr

For scripting only. When an error occurs, DiskPart continues to process commands as if the error did not occur. Without the noerr parameter, an error causes DiskPart to exit with an error code.

rescan

Locates new disks that might have been added to the computer.

retain

Prepares an existing dynamic simple volume to use as a boot or system volume.

On an x86-based computer, creates a partition entry in the master boot record (MBR) on the dynamic simple volume with focus. To create an MBR partition, the dynamic simple volume must start at a cylinder aligned offset and be an integral number of cylinders in size.

On an Itanium-based computer, creates a partition entry in the GUID partition table (GPT) on the dynamic simple volume with focus.

Note

The retain command is intended for use only during unattended Setup or by OEMs.

select disk

select disk=[n]

Selects the specified disk and shifts the focus to it.

Specifies the disk number of the disk to receive focus. If you do not specify a disk number, the select command lists the disk that currently has the focus. You can view the numbers for all disks on the computer by using the list disk command.

select partition

select partition=[{n|d}]

Selects the specified partition and gives it focus. If you do not specify a partition, the select command lists the current partition with focus. You can view the numbers of all partitions on the current disk by using the list partition command.

Specifies the number of the partition to receive the focus.

Specifies the drive letter or mount point path of the partition to receive the focus.

select volume

select volume=[{n|d}]

Selects the specified volume and shifts the focus to it. If you do not specify a volume, the select command lists the current volume with focus. You can specify the volume by number, drive letter, or mount point path. On a basic disk, selecting a volume also gives the corresponding partition focus. You can view the numbers of all volumes on the computer by using the list volume command.

Specifies the number of the volume to receive the focus.

Specifies the drive letter or mount point path of the volume to receive the focus.

setid

set id={<BYTE> | <GUID>} [OVERRIDE] [NOERR]

Change the partition type. Intended for Original Equipment Manufacturer (OEM) use only. A partition must be selected for this operation to succeed.

ID={<BYTE> | <GUID>}

Specifies the new partition type. For master boot record (MBR) disks, you can specify a partition type byte, in hexadecimal form, for the partition. Any partition type byte can be specified with this parameter except for type 42 (LDM partition).

For GUID partition table (GPT) disks you can specify a partition type GUID for the partition.

OVERRIDE

Enables DiskPart to force the volume to dismount first if necessary. All opened handles to the volume will become invalid.

NOERR

Caution: Changing partition type fields with this parameter might cause your computer to fail or be unable to start up. Unless you are an OEM or an IT professional experienced with GPT disks, do not change partition type fields on GPT disks using this parameter. Instead, always use the CREATE PARTITION EFI command to create EFI System partitions, the CREATE PARTITION MSR command to create Microsoft Reserved partitions, and the CREATE PARTITION PRIMARY command without the ID parameter to create primary partitions on GPT disks.

This command does not work on dynamic disks nor on Microsoft Reserved partitions.

Example:

SET ID=07 OVERRIDE

SET ID=ebd0a0a2-b9e5-4433-87c0-68b6b72699c7

shrink

shrink [DESIRED=<N>] [MINIMUM=<N>] [NOWAIT] [NOERR]

shrink QUERYMAX [NOERR]

Reduces the size of the volume with focus by the specified amount. Makes free disk space available from unused space at the end of the volume. A volume must be selected for this operation to succeed.

DESIRED=<N>

Specifies the desired amount of space in megabytes (MB) to reduce the size of the volume by. If a desired amount is not specified, the volume will be reduced by the maximum amount of free space available on the volume.

MINIMUM=<N>

Specifies the minimum amount of space in MB to reduce the size of the volume by.

QUERYMAX

Returns the maximum number of bytes that the volume can be reduced by (the free space available on the volume). This value may change if applications are currently accessing the volume.

NOWAIT

Forces the command to return immediately while the shrink process is still in progress.

NOERR

If a MINIMUM amount is not specified, the volume will be reduced by either the DESIRED amount (if specified), or by the maximum amount of free space available on the volume. If a MINIMUM amount is specified but not enough free space is available, the command will fail.

This command works on basic volumes, and on simple or spanned dynamic volumes. You can reduce the size of a volume only if it is formatted using the NTFS file system or if it does not have a file system.

Examples:

SHRINK DESIRED=500 MINIMUM=250

SHRINK QUERYMAX

DiskPart Scripting

By using the DiskPart Command-Line Options command-line tool, you can create scripts to automate disk-related tasks, such as creating volumes or converting disks to dynamic disks. Scripting these tasks is useful if you deploy Windows by using unattended Setup or the Sysprep tool, which do not support creating volumes other than the boot volume.

For more information about DiskPart scripts, see "Disk Management" in the Microsoft Windows XP Professional Resource Kit.

To start a DiskPart script, at the command prompt, type:

diskpart /s scriptname**.txt**

where scriptname is the name of the text file that contains your script.

To redirect DiskPart's scripting output to a file, type:

diskpart /s scriptname**.txt >** logfile**.txt**

where logfile is the name of the text file where DiskPart writes its output.

When DiskPart starts, the DiskPart version and computer name display at the command prompt. By default, if DiskPart encounters an error while attempting to perform a scripted task, DiskPart stops processing the script and displays an error code (unless you specified the noerr parameter). However, DiskPart always returns errors when it encounters syntax errors, regardless of whether you used the noerr parameter. The noerr parameter enables you to perform useful tasks such as using a single script to delete all partitions on all disks regardless of the total number of disks.

The following table lists the DiskPart error codes.

Error	Description
0	No errors occurred. The entire script ran without failure.
1	A fatal exception occurred. There might be a serious problem.
2	The parameters specified for a DiskPart command are incorrect.
3	DiskPart was unable to open the specified script or output file.
4	One of the services that DiskPart uses returned a failure.
5	A command syntax error occurred. The script failed because an object was improperly selected or was invalid for use with that command.

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DiskPart Command-Line Options

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DiskPart Syntax and Parameters

DiskPart Scripting

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