I upgraded my mid'09 13 MBP to the 500gb WD Blue disk, but I keep getting the clicking noise every 20secs or so while just browsing the web with my trackpad. (While I am typing something - including this post, there is no clicking). My questions are: 1. Will the 1.7 EFI firmware fix this? I think that is only for 7200 drives. I am on SL and not updated the firmware. 2. If not, I am going to return this as I cannot bear the sound. I dont mind the whooshing noise as it is not irritating. What should I get in place? My only criteria are reliability and noise. I just use the laptop mainly for browsing and dont care too much about performance.