The type of file system filter that most people are familiar with is probably the antivirus filter. This allows them to monitor, track, manage, manipulate, and even accept or reject I/O operations before the file system gets to see them. File system filters intercept I/O operations (from both applications and the system itself) before those I/O operations reach the file system. One of the most common, and also the most powerful, places to insert a filter in a Windows system is over a file system. There may also be manufacturer-specific filter drivers, such as a filter for a mouse or keyboard that adds support for buttons that are unique to a given model. For example, there are standard Windows-supplied filter drivers at the volume level that provide volume snapshot functionality (to support backups), as well as optional full volume encryption (in support of Windows Bitlocker). And, of course, filtering a device requires no change to the driver for the underlying device.įilter drivers are installed at many levels in a typical Windows system. A filter can add value to the functionality of an existing device by simply attaching itself over that device. The filter driver concept is one of the most powerful architectural features of the Windows I/O subsystem. Last reviewed and updated: 10 August 2020
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