Lenze IPC Operating System Windows Embedded Standard 2009 - Manual (Page 11)

Configuration
Lenze Write Filter Manager
Setup of the File Based Write Filters (FBWF)
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11 SHPWES EN 1.0
3 Configuration
3.1 Lenze Write Filter Manager
The Lenze Write Filter Manager in the Windows Embedded Standard image supports the
File Based Write Filter (FBWF) which denies write access to files on file level.
Any write access to a protected object is only saved volatilely to the RAM and will be gone
when the system is restarted.
The administrator is able to define certain files or folders as unprotected. Any write access
to an unprotected object is saved non−volatilely and will still be there when the system is
restarted.
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Note!
ƒ To change the Write Filter Configuration, administrator rights are required.
ƒ System partition C:\ has full write protection. Files and folders cannot be
defined as unprotected.
ƒ Generally, it should be impossible to write from a software application to
the system partition if the write filter is activated. Otherwise, the RAM may
fill up and overflow.
3.1.1 Setup of the File Based Write Filters (FBWF)
1. Start Lenze Write Filter Manager (<Start>
à System control à LDC Write Filter
Manager).
2. Activate the registry File Based Write Filter (FBWF) .
– Disable / Enable FBWF: Activates and deactivates, respectively, the File Based
Write Filter (FBWF)
– Volume: The here selected data media or partitions are protected against write
accesses. If a data medium or a partition is removed from the list, all
corresponding unprotected files and folders will be removed, too.
– Unprotected Files and Folders: Files and folders can only be entered as unprotected
if the corresponding data medium or the corresponding partition is listed on the
volume list.
– Remove: The removal of files, folders, or data media from the list is feasible by
marking the elements on the list and subsequent selecting the remove button.
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Note!
The File Based Write Filter cannot be activated or set up for the current
session. This is only possible for the next session after restarting the system.