# EldoS | Feel safer!

Software components for data protection, secure storage and transfer

### I have deleted the file in the backend storage, exposed by CBFS. How do I notify the system about this?

 Suppose you are exposing custom filesystem using CBFS and you (or other application) have deleted a file named "/path/to/filename.ext" from this backend filesystem. Now you need to inform CBFS and the OS that the file is gone. This is done by calling CallbackFileSystem.NotifyDirectoryChange method as follows: NotifyDirectoryChange("\path\to\filename.ext", fanRemoved);