Hey, I have a 400 G3 that has an annoying whine (presumably) coming from the HDD. It's a 20 gigger that came with the model. I want to quiet it down, so I will replace the HDD, with probably nothing more than 40 gigs. What HDD do you recommend? Also, and most importantly, is switching and moving ALL the DATA from the old HDD to the new one hard? Thanks!