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. Fix: (1) GPO: User Configuration\Administrative Templates\System\Removable Storage Access!Custom Classes: Deny write access (2) REG: HKEY_CURRENT_USER\Software\Policies\Microsoft\Windows\RemovableStorageDevices\Custom\Deny_Write!Deny_Write