When it's very quiet, I can here my HD accessing files even though it's idle (at least it isn't running any appls). PC seems to be working OK ... but I'm concerned about the HD 'wearing out' (PC - & HD - are 6 years old ... DELL Dimension 4300 - running XP Home, SP2 with 1 GB of ram).
Heard it over the past couple of years (at least) and defragging makes no difference (HD is 20 GB total ... partitioned to approximately 9.5GB for "C" and 9.5 for "E"). Defragged 2 days ago .... 26% free.
Maybe I'm being paranoid (I'm retired/disabled so lots of free time ... like the commercial says "with Suncom you have time to worry about other things", though I don't have SunCom as my cell phone provider) ... can someone provide a 'rational' explanation?