If your concerned that someone(thing) is accessing your HD while your idle bring up a command window (start-->run; type "cmd" then enter) and then run the command "netstat". that will give you a list of the ports that are open to your machine. If you have things like messenger, browsers steam etc running this can account for some of the connection. Try closing all web applications and observing what still has open ports. to be honest id recon its just normal windows activity (downloading updates etc) that's making your HD tick in idle, but worth checking it out, althou the log file does not look suspect.