Hi i have a 2008 imac and recently replaced the hard drive (HD). During the research process i found this was a common problem. This time i wanted to be able to keep the HD cooler so i downloaded smcfancontrol, i also downloaded iStat to monitor the temperature of various hardware in the iMac. My problem is that the software have vastly different readings e.g. with imac basically idle smc fan control says my HD is 30C whereas iStat says it is 43C this is a big difference. I don't want to run the fans harder than necessary or let my HD heat up too much. Thankyou for any advice you can give. p.s. This is my first post so sorry if i've not done everything correctly.