I have a server than runs 24/7, but much of the time there isn't much
demand placed on it. I have set the disk to spin down after 20min of
inactivity, but it never seems to reach this threshold. On closer
inspection, I see the hard disk light flicks on briefly every 5 secs or
so. I can't think what would cause this. Are there any tools that can
help my trace what is causing this disk activity?