9/18/2023 0 Comments Hdd fan control for mac![]() 20 iMacs used an external feed from the HDD's built in temp sensor to send the data to the Logic board. In 2004 G5 iMacs, 2006 White Intel iMacs, and 2007-2008 Aluminum iMacs, a discrete temp sensor was adhered to the hard drive to read temp independently of the drive's self-reported data. Apple thought it was safer for the HDD temp data to be sent directly to the Logic board to be analyzed by the OS. The OS can rely on this data for fan and temp control. ALL hard drives report a myriad of self-diagnostic information via SATA and SMART (see the pic on my June 6th post). In spite of what others here are saying I have seen no evidence that there is any special firmware in these hard drives. Mid-2010 and earlier iMacs with sensor cables that plugged into the hard drive are what I'm referring to. I'm perfectly willing to hack and modify things when it makes sense, (my Hackintosh is over- clocked to 4.7GHz, and I install Mt Lion and Mavericks on unsupported Macs all the time) but in this case it doesn't make sense. Nor do I want their iMacs running noisily because their fans have to be run at high speed all the time. I don't want to leave fan control up to my clients to monitor. Temperatures in a computer need to be monitored and the fans adjusted continuously for everything to work at peak efficiency. I don't think that any resistor or jumper is a good idea at all. I have done it this way since the very first drive replacement I had to do on one of these iMacs. The sensors from earlier iMacs (if they are the 2 lead type) also work. ![]() Then i attach the sensor with double-sided tape (same stuff we use to adhere glass on iPads and unibody MacBooks). They have 2 leads just like the iMac which I extend to reach the drive. There are several of them, I usually use the ones that are under each fan. The Macbook Pro aluminum models are the ones I usually use. I have used the sensors from earlier iMacs as well as from Macbook Pros. ![]()
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