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iMac Intel 27" EMC 2309 (Late 2009, Core 2 Duo 3.06 or 3.33 GHz) ID iMac10,1, EMC 2374 (Late 2009, Core i5 2.66 GHz or Core i7 2.8 GHz) ID iMac11,1

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Upgraded HD, now fan spinning fast (and faster)

I've upgraded my i5 1TB hard drive to a 2TB. There was a 1TB WD Caviar Black and I've upgraded to a 2TB Caviar Green. The temperature sensor is working because iStat gives me a temperature around 100F. However the HD Fan starts around 2000rpm and is getting faster and faster (10 min later its at 3700RPM). I took care to use the same manufacturer, but maybe that's not enough? Or did I miss something when I put it back together? I also did a SMC reset just in case. Anyone have thoughts on this? Have you experienced this? Should I try a different drive?

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Figured it out. The hard drive temperature sensor cable can be installed either gray wire up or down. I thought I noted it was Gray up when I disengaged it. Well I swapped it and now everything is good. Temperature is still nominal and the HD fan speed is around 1100rpm. So I guess I can confirm that the Caviar Green works on these iMacs. Hopefully they'll help keep it a little cooler too.


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Thanks for the update mentioning the orientation of the cable - I had made the exact same mistake and was just about to put the original disk back in! So I can also confirm that the WD 2TB Caviar Green works.

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Which pins did you connect the HD sensor to on the WD Caviar Green?


Is it obligatory to use a WD Caviar HD?


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smm76 zal eeuwig dankbaar zijn.

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