I used to use WDs exclusively not too long ago and this is what I've noticed. They start out quiet but they seem to develope a whiny spindle noise after a bit. Maybe the newest models are better but that just turned me off, they became the loudest thing in my rig! Sure WDs RMA policy is nice, they gladly replaced them because I said they were noisy and they even said, "...if you're not happy with the drive..." So I switched to Seagate and let me tell you, when I first pluged it in I was elated, much quieter. I've had two 200gb 7200.7 IDEs for maybe a year or so now and they are still quiet. Just got two 300gb 7200.8 SATAs and the only difference I've noticed is they run hotter than the 7200.7 I thought I heard that SATAs run hotter so that may be it. Finally Seagate now has a 5 year warranty.