Like some of the other people who bought this HD only to have it suddenly stop working on them, mines has done just that today. I was using it fine up until a few hours ago until I noticed it was producing a soft clicking sound that I had never heard before. Thinking it best to restart the hard drive and my PC as well, I powered my machine down and turned it back on, only to be greeted by a soft beeping noise from the external hard drive.
It no longer shows up on my computer, despite the fact it's there in my Device Manager (but not Disk Manager, so I can't even reformat it). It makes no difference if I plug it into a different USB port on my PC, or even a completely different computer altogether. The same thing happens - it shows up in the Device Manager, which states that the storage device is working properly, but is not found under the Disk Manager and doesn't show up under "My Computer" either.
I'm quite upset with this, as it's been working perfectly fine since I first bought it back in January. Now I'm not even sure how I'm going to get around to recovering the data I have saved on it. Some is backed up on another HD, but not everything is backed up and I didn't expect it to suddenly die on me so suddenly without any kind of warning.
So I would say, stay clear of this product. If you're very lucky, you might get one that doesn't mysteriously die on you, but you might end up being really unlucky like a few of us here who got ones that died and ended up losing a lot of important data.