Policy

Custom Classes: Deny write access

Windows 11 25H2

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Policy overview

Key metadata and intent for this policy.

ClassUser
CategorySystem > Removable Storage Access
Supported onAt least Windows Vista

Supported OS tags: Windows10, Windows10RT, Windows11, Windows7, Windows8, Windows81, WindowsRT, WindowsRT81, WindowsServer2008, WindowsServer2012, WindowsServer2012R2, WindowsServer2016, WindowsVista

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.

Internal name
CustomClasses_DenyWrite_Access_1
Policy ID
26f9c5da737e
Elements
1

Registry values

How enabled and disabled states update the registry.

Registry locationTypeEnabled valueDisabled value
HKCU\Software\Policies\Microsoft\Windows\RemovableStorageDevices\Custom\Deny_Write\Deny_WriteREG_DWORD
1
0

Policy elements

Inputs and configuration options exposed by this policy.

ElementTypeRegistry mappingConstraints & behavior
GUID for custom removable storage class:
ID CustomClasses_List
list
HKCU\Software\Policies\Microsoft\Windows\RemovableStorageDevices\Custom\Deny_Write\List\Deny_Write
Type REG_MULTI_SZ
List: additive

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