i would add more pts but i'm kinda out :$
i have this P4 system i got in april-may 2002. it came with a 40GB Maxtor D740X-6L, and was bloody quiet. then after a few months it became viciously loud with a whirring noise very audible within 20 feet from another room. Just this monday i replaced it with a 80GB Western Digital Caviar SE (!!!), and it became nice and quiet again. But then today i noticed that it's developing the exact same noise as the maxtor drive. Don't get me wrong, but i dont' think two relatively high quality drives would instantly go out like that; my friend has a 100GB WD Caviar SE and an identical 40GB drive and they've been pushed much harder than mine, and they're silent. No rattling; this is internal to the drive by using my ears and an open case. Could the 320W PSU be dead, or even my home's electric power be faulty (both disks still work like normal except their dB is not the advertised 35 or so)? I noticed that my PC builder bundled up all the power cables in a big bunch, and the one connected to the disk also has an extra set of wires connected to the hard drive cooling fan.
of course i'm using a powerstrip.
i've been trying to fix this problem for months and i still have no clue what is wrong; i moved the 40GB into another system, and the disk is actually beginning to get quieter.