Wasn't sure if I should post this in the OS X forum or the hardware specific problem. Anyway, every now and then my MacPro will get supper sluggish and i can hear the harddrive churning away. Inside Activity Monitor, I can see the disk usage graph spike big time, but it doesn't tell me what applications (or services) are ass-raping my harddrive when this happens. Most of the apps listed show nominal CPU usage. What can I use to see what's paging my harddrive when this happens? thnks!