This has just been happening the last three days or so, tried googling for an answer but haven't had any luck. PC can be sitting idle & all of a sudden the hd just spins up for no reason. Was here at VDR tonite & looking at threads, hd spun up all of a sudden & the site froze, waited a minute or two, hd slowed down again & everything went back to normal. Any idea what could be causing this. Thanks BJ