It is useful for some - mainly if you do searches for data on your system. I almost never search for anything, so by choice, I turn it off. That gets rid of a lot of HDD activity. I also have my PageFile on a separate partition, and likewise my temporary Internet files as well as data. Another feature I disable is System Restore and Shadow copies. Again, my systems uses duplicate HDDs in mobile racks. If a drive should happen to go bad, I just switch to a reserve drive.
CorkyG - Tucson, AZ
... Lack of transparency is a huge political advantage. And basically, call it the stupidity of the American voter or whatever, but basically that was really really critical for the thing to pass...... Dr. J. Gruber, ACA Architectural Consultant