MPC-2121/2101 Series Win 7 UM
Enabling Embedded Filters
4-7
File-based Write Filter
Overview
According to Microsoft:
File-Based Write Filter (FBWF) allows the Windows Embedded platform to maintain the
appearance of read and write access on write-sensitive or read-only storage. FBWF makes read
and write access transparent to applications.
Writing to storage media may be undesirable or impossible in embedded devices. FBWF redirects
all writes targeted for protected volumes to a RAM cache called an overlay. Used in this context,
an overlay is similar to a transparency overlay on an overhead projector. Any change made to the
overlay affects the picture as seen in the aggregate, but if the overlay is removed, the underlying
picture remains unchanged.
FBWF provides the advanced feature than EWF to let user specify the directory to write the data to disk
drive directly, in our default setting, the default directory is under c:\temp, which means you can read/write
the data into disk without commit action.
Enable File-Based Write Filter
There has conflict between Enhanced Write Filter (EWF) and File-Based Write Filter (FBWF), disable EWF
before enable FBWF.
To enable file-based write filtering, do the following:
1.
Right-click the lock icon.