Well, I am a bit desperate, hope someone can help me out with this one. I have posted a few problems in the last weeks, but the problems keep on going. I have bought two hd's, one three weeks ago, one two weeks ago. I was very happy I finally had the money to buy 'em. But the first one made klicking sounds from the beginning, so I brought it back and got a new one. That one wasn't only making klicking sounds BUT ALSO 'hang' now and then. Every now and then it would hang for a split second, make a loud klick, and go on, sometimes this would happen like three or four times in a row, like a stutter. Everytime I thought my system would crash. Anyway, I brought that one back too and got a another new one. That one is the one I'm using now, with my operating system on it. The second hd, the one I bought one week after the first, seemed to be fine. No clicking sounds or other problems. So I put most of my personal stuff on it, to be sure I would not lose them, like photos and stuff. Yesterday I started to burn my stuff on dvd's to be even more sure. But in the middle of the first burn, the burning process stopped and since then this hd is not responding anymore. It is not visible at start-up, in my bios or in windows. I really am at a loss. THREE out of FOUR hd's defective? That's 75%! I have tried different cables to make sure it wasn't that, I have no clough whatsoever how this is possible. The disks are of this type: WDC WD5000AAKS-00YGA0 They're a new model from Western Digital. I have Speedfan installed and when I do a smart test (with the one that is working at the mo, though not sure how long that one will keep going...) I get this: "Since your hard disk is not in the current database, overall ratings and pictures will be based upon realistic values, but you should carefully check the results." So it's a very new model. Could there be something wrong with the model? Some production error or something? Or some compatibility issue? I'm totally at a loss. If I go back again to the shop I'm not sure they will believe me one more time. But in the past I have like bought and installed about 15 hd's myself, never had a problem. My system is fairly ok, just one year and a few months old. I use a certified XP pro, which is not giving me any trouble and no other hardware issues. I have an up to date security suite and never had problems with viruses or other malware in the past. So... anyone any idea?