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Custom Classes: Deny write access

Policy ID
CustomClasses_DenyWrite_Access_2
Scope
Computer 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

ComputerHKEY_LOCAL_MACHINE
HKLM\Software\Policies\Microsoft\Windows\RemovableStorageDevices\Custom\Deny_WriteView registry values
  • Deny_WriteREG_DWORD
HKLM\Software\Policies\Microsoft\Windows\RemovableStorageDevices\Custom\Deny_Write\ListView registry values
  • (list values)REG_SZ

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