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
In my view you cannot claim to have seen something until you have photographed it.... Emile Zola