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How to check if legacy drivers are running

Windows is configured to block legacy file system filters. This is what the key looks like in Registry Editor:Įxample: when a legacy driver is blocked from loadingĪn Error event is logged to the System event log when a legacy file system filter driver is blocked from loading, as shown here: Event property In this release, this is the default behavior. Legacy file system filter drivers are not blocked. Legacy file system filter drivers are blocked from loading or attaching to storage volumes. The valid DWORD values for the IoBlockLegacyFsFilters key are as follows: IoBlockLegacyFsFilters value The registry key must be created under the following registry path: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\I/O System For the registry changes to take effect, perform a system restart. When blocked, all legacy file system filter drivers are blocked from loading. Use the IoBlockLegacyFsFilters registry key to specify if the system blocks legacy file system filter drivers.

To port your legacy driver to a minifilter driver, see Guidelines for Porting Legacy Filter Drivers. For optimal reliability and performance, use file system minifilter drivers with Filter Manager support instead of legacy file system filter drivers.