iMac i3 - fan runs wild after HD upgrade

Discussion in 'iMac' started by lefse, Feb 1, 2011.

  1. lefse, Feb 1, 2011
    Last edited: Feb 1, 2011

    lefse macrumors member

    Joined:
    Jul 11, 2008
    #1
    I bought a Seagate Barracuda XT 2TB (ST32000641AS) to replace a the 500GB Seagate hard drive that came with the machine (ST3500418AS).

    Same brand, same connectors, though the hard drive fan now spins up to over 5000rpm after a few minutes. Tried SMC reset, but no change.
    I am now using smcfancontrol.app (2.2.2) to get the hard drive down to a half way acceptable 2500rpm.

    The temperature value of the new hard drive does show up in the istat pro widget (29c), however, in the slightly older smsfancontrol.app (2.2.2) it reports the temperature as zero.

    Anyone who have had experience with this? Did some googling, and it seems to me that Apple adds special firmware to these drives.
     
  2. John T macrumors 68020

    John T

    Joined:
    Mar 18, 2006
    Location:
    UK.
  3. lefse thread starter macrumors member

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    Jul 11, 2008
    #3
    No. I believe the hard drive in iMacs aren't seen as user replaceable.
    Either way, there is no point in sending it back to Apple - the machine does work perfectly well with the original HD.
     
  4. TMRaven macrumors 68020

    TMRaven

    Joined:
    Nov 5, 2009
    #4
    That temp sensor was only designed to work for the hdd that was already in the iMac. You'd have to go back in and short it out, or buy a new temp sensor.
     
  5. lefse thread starter macrumors member

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    Jul 11, 2008
    #5
    Why would I buy a new temp-sensor? The sensor is _in_ the hdd.
    And if i short it, what good would that do? I can still control the fan manually from smcfancontrol.app.
     
  6. nicroma macrumors 6502

    nicroma

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    Midwest, USA
    #6
    .
     
  7. TMRaven macrumors 68020

    TMRaven

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    #7
  8. lefse, Feb 1, 2011
    Last edited: Feb 1, 2011

    lefse thread starter macrumors member

    Joined:
    Jul 11, 2008
    #8
    I am obviously not fine with controlling the fan manually - else I would not have asked if anyone had experience with swapping hdd's in an iMac i3 (or i5/i7).

    The new iMacs reads the temperature from an internal sensor _inside_ the hdd.
    Hence have I bought another hdd of the same brand with the same temperature sensor-connection next to the sata/power slot.

    Shorting the sensor is for situations where there is nowhere to plug the sensor connector. Your SSD-upgrade links are therefor useless.

    I wish people would care to read a bit more, before showing off their diehard ignorance
     
  9. John T macrumors 68020

    John T

    Joined:
    Mar 18, 2006
    Location:
    UK.
    #9
    Oh dear! I assumed you'd appreciate that a call to either Apple or one of their Service Centers would give you the relevant info.
     
  10. lefse thread starter macrumors member

    Joined:
    Jul 11, 2008
    #10
    You're right, sorry. I'll do that.
     
  11. John T macrumors 68020

    John T

    Joined:
    Mar 18, 2006
    Location:
    UK.
    #11
    Yes, on the few occasions when I've needed help such as this I've always found them to be most helpful.
     

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