Hi, recently I upgraded the HDD of my macbook pro 13"(2009) to a Hitachi 7200RPM 500GB(7K500), it generates clicking noise and the Load_Cycle_Count attribute increases too fast, which has a 600000 limit. I searched on the forum, and saw many people have the same problem, someone suggests LCC is not spin-up/spin-down but Start_Stop_Count is, which is NOT true for laptop, it is only true for desktop with Windows which do not care about power saving so the HDD seldom parks its head. Today I went to my friends house who has a desktop PC which support SATA HDD, so I plugged my 2.5" HDD in straight away, and booted from Hitachi's Feature Tool(you can google it and find the address), then I was able to adjust the APM level. Here are two photos: I made it 192, which is the lowest value within Active idle range as I usually use my MBP as a desktop replacement, so battery is not an issue. Hope this can help people with Hitachi HDD who are annoyed by the clicking noise and worried about the shortened life of HDD.