I can hear my C hard drive thrashing away when my system is idle, and even when my system is running programs.
Thought it might be Firefox that's using the hard drive a lot - checked it out, uses the hd a bit but no more than usual, but I can still hear the hard drive clicking away. So I close...
chrome
disk usage
driver issues
file shield
firefox
hard drive
internet explorer
malware
performance issues
process explorer
raid driver
resource monitor
safe mode
svchost
sysinternals
system processes
task manager
thrashing
windows 7
windows media network
