MPC-2121/2101 Series Win 7 UM
Enabling Embedded Filters
4-2
Enhanced Write Filter
Overview
Enhanced Write Filter (EWF) provides a means of protecting a volume from writes. This allows the operating
system (OS) to boot from write-protected hard disks. All written data to EWF-protected volumes (The Hard
disk in the following figure) are redirected to an overlay (EWF Volume in the following figure). Because EWF
does not write data to the hard disk directly, it can protect the hard disk from sudden power loss. The data
written is cached in the overlay and made available as part of the volume. This gives the appearance that
the volume is writeable. The overlay is an independent storage location, which exists in random access
memory (RAM). If desired, the data stored in the overlay may be committed to the protected volume. Refer
to the following figure for the overview of the EWF structure.
Enabling Enhanced Write Filter
Follow these steps to enable the Enhanced Write Filter
1.
First open right-click the lock icon in the left side.
