Optionally, but not necessarily, {TAIL ~ the direct file system access engine} is {HEAD ~ one or more Windows DFA kernel driver} 
Optionally , but not necessarily , { TAIL ~ the direct file system access engine } is { HEAD ~ one or more Windows DFA kernel driver }
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD