Custom Classes: Deny write access

Policy ID: CustomClasses_DenyWrite_Access_1
Scope: User Configuration
Supported on: At least Windows Vista
Source: Administrative Templates (.admx) for Windows 11 2026 Update (26H2) (version 1.0)
Category: System › Removable Storage Access

Description

This policy setting denies write access to custom removable storage classes.

If you enable this policy setting, write access is denied to these removable storage classes.

If you disable or do not configure this policy setting, write access is allowed to these removable storage classes.

Options

Enter GUID in format {xxxxxxxx-xxxx-xxxx-xxxxxxxxxxxx},
include brackets. Each custom GUID must be a separate entry
GUID for custom removable storage class:

Registry

UserHKEY_CURRENT_USER

HKCU\Software\Policies\Microsoft\Windows\RemovableStorageDevices\Custom\Deny_Write View registry values

Deny_WriteREG_DWORD

HKCU\Software\Policies\Microsoft\Windows\RemovableStorageDevices\Custom\Deny_Write\List View registry values

(list values)REG_SZ

Other policies in the same category

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