Hello, I have a 320Gb WD blue HDD in my ibook G4 for years. Now I beleive it is getting very hot, but I am not sure, if I am just subjectively feeling it different or if it is a combination with room temperature or if a recent incident (when someone slammed his fist on the desk, near my ibook, which was running) is the maybe the cause. I know that it wasn't exactly cold or warm earlier anyway, but I think it is hooter now. Currently 52°C (125°F), but I believe I had 54°C lately. SMART says it is within tolerance. You can measure it with this tool http://www.macupdate.com/app/mac/12381/temperature-monitor or the trial of Volitans SMART Utility. It migth as well be, that I am just paranoid and the temeperatures have always been that way. Thanks.