Summary: I've installed these on two different home built systems now and, so far, I'm pleased. I've had issues in the past with dying hard drives and heat was probably part of the issue. I tried a few hard drive fans but they were often hard fit into existing systems and they also added to the overall noise factor. So when building some new systems I did some research and decided to try these Zalman HD coolers. They do a nice job without using fans.
Summary: I am not sure what other reviewers complained about - the cooler fit properly over my WD 1 tb hard drive and the screws were the proper size to attach the hard drive to the cooler. The vibration dampening rubber studs to adapt to a 5 1/4 bay slot simply screw into the cooler. The only thing I can possibly see complaints about is that the screws included to attach the cooler to the computer case are too small - I had my own anyways so I didn't care about this.
Summary: COULD HEAR THE HD SEEK DATA BEFORE INSTALLING THIS PRODUCT, HD BECAME ALMOST COMPLETELY SILENT AFTER. MADE HD TEMP INCREASE MUCH SLOWER, BUT EVENTUALLY WOULD REACH A TEMP ONLY SLIGHTLY LOWER THAN BEFORE INSTALLATION. BUT MY COMPUTER IS A COMPLETELY FANLESS SYSTEM, I BELIEVE THE COOLING EFFECT SHOULD BE MUCH BETTER IF THERE IS A CASE FAN.
Summary: Pros: Another fine product from Zalman. It's basically two blocks of aluminum that run the full length of your hard drive, with heat pipes connecting the two. The unit conducts heat very well, negating the need for active cooling (fans). This, along with the rubber mounts (which, honestly, are too hard to be terribly effective at minimizing vibration) make the Zalman Hard Drive Cooler a great addition to a quiet pc. Cons: Watch out for sharp edges.
Summary: Vraiment tres efficace pour le silence et le refroissement a condition d'avoir un ventilo qui souffle gentiment dessus. Les pieds en caoutchouc jouent tres bien leur role concernant les vibrations du disque. J'ai installé a l'interieur un disque Samsung Spinpoint 160Go en Sata avec de la pate thermique pour ameliorer le contact entre le disque et le rack, et avec un ventilo Papst 12 cm au minimun dessus et cela donne des temperature qui tourne entre 20 et 32°c Niveau...