User tasks
4.6 Managing the Enhanced Write Filter
SIMATIC IPC427C Bundles, SIMATIC HMI IPC477C Bundles
36 Manual, 07/2009, A5E02280126-02
The ewfmgr commands that are applicable are shown below, as applied to the C:\ drive:
Enable the EWF:
Command: ewfmgr c: -enable
Commit data to CompactFlash:
Command: ewfmgr c: -commit
Commit data to CompactFlash and disable the EWF:
Command: ewfmgr c: -commitanddisable
Note that the initial state of the Enhanced Write Filter is "disabled". Following a
"commitanddisable" command, use the "enable" command to protect the CompactFlash
card. All subsequent data writes will go to virtual memory.
Note
If the Enhanced Write Filter was shut down before downloading to WinLC RTX, you must
click the "Enable/Disable Station" button in the Station Configuration Editor.
Replacing the CompactFlash card
In order to ensure a correct restart of WinLC RTX on a SIMATIC Embedded Bundle after
replacing the CompactFlash card, perform one of the following steps:
● Disable the EWF for the CompactFlash drive before replacing the CompactFlash card
and enable it after the first start of WinLC RTX.
● Store the WAF file (retentive data) on a drive on which the EWF is disabled.
Otherwise the next time you start WinAC RTX, it will start with an unbuffered startup.
File-Based Write Filter (FWBF)
You can use also an FBWF to protect a CompactFlash card. You can find further information
about the FBWF in the internet (http://msdn.microsoft.com/en-
us/library/aa940926(WinEmbedded.5).aspx).
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