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Dismount-VMHostAssignableDevice

Dismounts a device from a virtual machine (VM) host.

Windows Server · Risk: High · Documentation Verified

Last verified: 2026-10-26

Microsoft Hyper-V reference: Dismounts a device from a virtual machine (VM) host. 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.

Dismount-VMHostAssignableDevice [-InstancePath <String>] [-LocationPath <String>] [-Force]
 [-Passthru] [-CimSession <CimSession[]>] [-ComputerName <String[]>] [-Credential <PSCredential[]>]
 [-WhatIf] [-Confirm] [<CommonParameters>]

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Required permissions

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

Supported environments

Windows / Hyper-V · Windows Server 2025 documentation; feature/module prerequisites apply

Parameters

-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.
-ComputerName: Specifies one or more Hyper-V hosts from which the assignable devices are to be dismounted. NetBIOS names, IP addresses, and fully qualified domain names are allowed. The default is the local computer. Use localhost or a dot (.) to specify the local computer explicitly.
-Confirm: Prompts you for confirmation before running the cmdlet.
-Credential: Specifies one or more user accounts that have permission to perform this action. The default is the current user.
-Force: Forces the command to run without asking for user confirmation. Using the Force parameter also overrides some security checks in the platform. To learn more, see Dismount the device from the host partition . If no partitioning driver is provided, during dismount, you must use -Force to bypass the security warning. For more information about the security implications, see Plan for deploying devices by using Discrete Device Assignment.
-InstancePath: Represents the Device Instance path in the host machine.
-LocationPath: Specifies the location path to the assignable device.
-Passthru: Returns an object for each process that the cmdlet started.
-WhatIf: Shows what would happen if the cmdlet runs. The cmdlet is not run.

Prerequisites

Windows with the Hyper-V 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

Example 1

Dismount-VMHostAssignableDevice -InstancePath "PCIROOT(0)#PCI(1D02)#PCI(0000)"

This example dismounts the device with the specified instance path from the host, making it available for assignment to a virtual machine. Source: Microsoft, CC BY 4.0; transcript prompt/output removed. This example was not executed.

Sources

https://github.com/MicrosoftDocs/windows-powershell-docs/blob/b7645dd8c687139b28e845119da30ec670526507/docset/winserver2025-ps/Hyper-V/Dismount-VMHostAssignableDevice.md

https://learn.microsoft.com/powershell/module/hyper-v/dismount-vmhostassignabledevice?view=windowsserver2025-ps

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