Enhanced_Write_Filter
Enhanced Write Filter (or EWF) is a component of Windows XP Embedded and Windows Embedded Standard 7 which stores volume changes on another medium instead of applying them to the original volume.[1] EWF allows the writes to be discarded or committed to the original volume later (either directly or through inaction based on the configuration). As this minimizes writes to a specified hard disk, EWF and FBWF (File-Based Write Filter)[2] have become popular in enthusiast computing as a way of decreasing wear of solid-state drives on netbooks and CarPCs.
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