Hello MR community! I upgraded my HDD in my 2010 13" MBP to a 500GB 7200RPM Hitachi Travelstar 7k500 in around August. I installed hdapm, etc... It has been great. Except that I just had my MBP in for repair. I switched the HDD in my White MacBook, forgetting about hdapm. I went 2 days without hdapm because the MacBook did not set hdapm power values to max. This means that it was constantly doing tons and tons of loadcycles on the HDD. I just realized this when my MBP started making horrible noises coming from the HDD area. I just set hdapm values to max and it is fine. But, it is still making those sounds. I have a time machine backup. Should I clone the HDD tonight, deleting the time machine backups? I have uploaded an audio recording that I recorded with my iPhone for you to analyze. The link is here. The sound that I am concerned about is the clicking that is noticeable at the beginning of the recording. Thanks, Alpha Edit: I just noticed that it happens whenever I boot up or open an application.