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
"Ineptocracy- a system of government where the least capable to lead are elected by the least capable of producing, and where the members of society least likely to sustain themselves or succeed, are rewarded with goods and services paid for by the confiscated wealth of a diminishing number of producers." - Merritt Man, 2011