Hello, my current HDD in my late 2009 iMac shows S.M.A.R.T. status: Failing. I want to replace the HDD asap (backup of the data is up to date, so no worries regarding an imminent failure). But I don't know which drive I can use without running into the fan control problem. As far as I know, the iMac late 09 uses the HDD internal temp sensors paired with a special firmware in the drive to control the fans. The current drive is a Seagate ST31000528AS (Firmware)Version AP2E Can I use any other ST31000528AS? I'm unable to find a list with firmware versions which will work with the 2009 model correctly. I hope someone can help me out // ifixit quote: "the replacement hard drive must be of the same brand as the original. The model number of the hard drive does not matter as long as the brand matches." Can anyone confirm this?