3
The State Of The Filter World
Many products use a file system filter
Historically, caused much customer pain
Issues include stability, performance, & interoperability
Examples of products with filter drivers:
Antivirus products
Filter watches I/O to and from certain file types (.exe, .doc, etc.) looking for virus signatures
File replication products
File-system-level mirroring
System Restore
Backs up system files when changes are about to be made so that the user can return to the
original state
Many more…
Quota products, backup agents, undelete, encryption products, etc.
We’ve come a long way in addressing issues with filter drivers:
Improved documentation
Plug-fests
AV certification program
However, 7% of OCA crashes are still attributed directly to 3
rd
party filter drivers
