frequently, in the middle of the night when i am totally inactive on my pc, i hear the HD chatting away incessantly for long periods of time, anywhere from 10-30 minutes. when i come in to check it out and move the mouse or change focus by clicking on anything, it stops for the duration of my activity. about ten minutes after i leave, it starts again. not every night, but many nights. naturally, this has me a little paranoid. i'm running XP pro. at night, only tradestation, tws and excel are running behind zonealarm (which is configured correctly to only allow incomming and outgoing traffic by user permission on a case by case basis). ZERO other applications in the taskbar by the clock. in tradestation, i'm not feeding any busy data after hours. i update and run spybot frequently to do housecleaning. as far as i know, i have no regularly scheduled pc maintenance type activity at all. it's not tws logging back in at 12:40 or so, or TS reloading charts after the occasional disconnect and refresh. i defrag regularly. what could this be??