There are a couple of threads on this that I've gone over on a couple of websites a couple of times each, but there still seems to be no definitive answer and some of them have gone off-track to enclosures, installation etc. rather than discussion about the drives. What I've seen is that most people are saying the Hitachi is faster, slightly hotter and noisier. Since it's going in a laptop, I'll take the WD for running slightly quieter and and cooler. The one thing that I'm worried about is that some WD owners are saying that there is "a audible click per second" which seems like it would be kind of annoying. Is this true? Any suggestions or comments (about the subject matter) are welcome. The WD Black is about 3 dollars cheaper than the Hitachi, so the fact there is so little difference in price makes this an even harder decision! Haha. Thanks.