Disk Diagnostic: Configure custom alert text: registry value DfdAlertTextOverrideComputerHKLM\SOFTWARE\Policies\Microsoft\Windows\WDI\{29689E29-2CE9-4751-B4FC-8EFF5066E3FD}

Policy ID: DfdAlertPolicy
Scope: Computer Configuration
Supported on: Windows Server 2008 with Desktop Experience installed or Windows Vista
Source: Administrative Templates (.admx) for Windows 11 2026 Update (26H2) (version 1.0)
Category: System › Troubleshooting and Diagnostics › Disk Diagnostic

Registry

DfdAlertTextOverride

REG_SZComputer

HKLM\SOFTWARE\Policies\Microsoft\Windows\WDI\{29689E29-2CE9-4751-B4FC-8EFF5066E3FD} Current key

Enabled value: Depends on the option value
Element: Custom alert text
Value type: REG_SZ
Required: true
Maximum length: 512

Apply with .reg · CMD · PowerShell

.reg

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WDI\{29689E29-2CE9-4751-B4FC-8EFF5066E3FD}]

; Value names and types follow the ADMX. Replace <enter value> below with your own data
"DfdAlertTextOverride"="<enter value>"

CMD

:: Value names and types follow the ADMX. Replace <enter value> below with your own data

reg add "HKLM\SOFTWARE\Policies\Microsoft\Windows\WDI\{29689E29-2CE9-4751-B4FC-8EFF5066E3FD}" /v "DfdAlertTextOverride" /t REG_SZ /d "<enter value>" /f

PowerShell

# Value names and types follow the ADMX. Replace <enter value> below with your own data

New-Item -Path 'HKLM:\SOFTWARE\Policies\Microsoft\Windows\WDI\{29689E29-2CE9-4751-B4FC-8EFF5066E3FD}' -Force | Out-Null
New-ItemProperty -Path 'HKLM:\SOFTWARE\Policies\Microsoft\Windows\WDI\{29689E29-2CE9-4751-B4FC-8EFF5066E3FD}' -Name 'DfdAlertTextOverride' -PropertyType String -Value '<enter value>' -Force | Out-Null