File and Directory Management Transparency

  • Article

Applications and OS components make file and directory management calls without knowledge that writes are being cached by FBWF. FBWF provides a composite view of the file system without imposing limitations on user mode applications. Applications perform explicit file I/O through functions such as CreateDirectory, CreateFile, ReadFile, and WriteFile. These calls appear to interact with the file system but may result in overlay cache I/O.

The following directory management operations may result in error:

  • Moving files across protection boundaries, for example, from a protected volume to an unprotected volume.
  • Committing new or deleted files.

FBWF supports NTFS and FAT32 file systems. FAT12, FAT16 and Flash File System are not supported.

FBWF can protect formatted volumes only. FBWF cannot recognize unformatted volumes.

Files in FBWF overlay cache are unencrypted.

See Also

Selective Commits and Restores

Last updated on Wednesday, October 18, 2006

© 2006 Microsoft Corporation. All rights reserved.