My OS is XP. I have noticed since I replaced the hard drive in my computer at home that when I leave the computer on over night the hard drive light indicates that it is running wide open the next morning. When I try to check what is running with the task manager it stops. I can't find any processes in the task manager that would cause this. I have tried to research this and found someone indicated that the drive maybe indexing. Should I leave it on for days to see if that is the problem? Other than that the computer works fine. Obtw it is maxed out with 2gigs of memory