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Resize-Partition

Resizes a partition and the underlying file system.

Last verified: 2026-10-26

Microsoft Storage reference: Resizes a partition and the underlying file system. The syntax and selected example below are adapted from the pinned Windows Server 2025 reference. Module availability, target configuration and delegated permissions determine whether it can run in your environment. Documentation and parameter text: Microsoft, CC BY 4.0; formatting adapted by Cmdlet World. No execution testing is claimed.

Resize-Partition [-DiskNumber] <UInt32[]> [-PartitionNumber] <UInt32[]> [-Size] <UInt64>
 [-CimSession <CimSession[]>] [-ThrottleLimit <Int32>] [-AsJob] [-PassThru] [-WhatIf] [-Confirm]
 [<CommonParameters>]

Required permissions

Use an account with the target resource permissions documented for Resize-Partition. Modifying administrative cmdlets may require elevation or delegated administration. This catalog does not assert that ordinary users can execute the command.

Supported environments

Windows / Storage · Windows Server 2025 documentation; feature/module prerequisites apply

Parameters

-AsJob

Runs the cmdlet as a background job. Use this parameter to run commands that take a long time to complete.

-CimSession

Runs the cmdlet in a remote session or on a remote computer. Enter a computer name or a session object, such as the output of a New-CimSession or Get-CimSession cmdlet. The default is the current session on the local computer.

-Confirm

Prompts you for confirmation before running the cmdlet.

-DiskId (required)

Specifies an ID used to identify a disk in the system.

-DiskNumber (required)

Specifies an array of disk numbers.

-DriveLetter (required)

Specifies a letter used to identify a drive or volume in the system.

-InputObject (required)

Specifies the input object that is used in a pipeline command.

-Offset (required)

Specifies the starting offset, in bytes.

-PartitionNumber (required)

Specifies the number of the partition. The number of the partition to be resized.

-PassThru

Sends items from the interactive window down the pipeline as input to other cmdlets. By default, this cmdlet does not generate any output. To send items from the interactive window down the pipeline, click to select the items and then click OK. Shift-click and Ctrl-click are supported.

-Size (required)

Specifies the size of the partition to create. If not specified, then the number will default to Bytes. The acceptable values for this parameter are: Bytes, KB, MB, GB, or TB. The size may be defined by a user.

-ThrottleLimit

Specifies the maximum number of concurrent operations that can be established to run the cmdlet. If this parameter is omitted or a value of 0 is entered, then Windows PowerShell® calculates an optimum throttle limit for the cmdlet based on the number of CIM cmdlets that are running on the computer. The throttle limit applies only to the current cmdlet, not to the session or to the computer.

-WhatIf

Shows what would happen if the cmdlet runs. The cmdlet is not run.

Prerequisites

Windows with the Storage module and the Windows feature or management tools that provide it. Confirm target connectivity and version compatibility using the linked Microsoft reference.

Security considerations

This cmdlet changes system state. Review every target and parameter in the official reference, test outside production, and prepare an appropriate backup or rollback. Do not execute the example automatically.

Examples

Resize-Partition -DiskNumber 3 -PartitionNumber 2 -Size (900GB)

Sources

https://github.com/MicrosoftDocs/windows-powershell-docs/blob/b7645dd8c687139b28e845119da30ec670526507/docset/winserver2025-ps/Storage/Resize-Partition.md

https://learn.microsoft.com/powershell/module/storage/resize-partition?view=windowsserver2025-ps

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