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Ursprünglicher Beitrag von: willg ,

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Yet another update. This one is to warn people to really pay close attention to the drive that is in their iMac. First, and foremost, the 1TB Seagate drive linked in this guide [guide|1634] will not work properly in a late 2009 27" iMac, model EMC 2374 quad core i5. After my last post I ordered another drive, this time from http://www.macsales.com/. If you look at my last post I determined that the Seagate model# ST31000524AS, again linked in the above guide, had some slight differences from the drive I pulled out of my iMac, which was a Seagate model# ST31000528AS. So, I went to http://www.macsales.com/ and specifically ordered the ST31000528AS. To my surprise they shipped me another ST31000524AS. I called them and explained this, explained why I specifically ordered the ST31000528AS, and was told it was a technical issue and they transferred me. This is where it gets good..The "tech" seemed less than interested in what I was saying and finally interrupted me and stated "you have to buy a replacement from Apple." I asked why they shipped me the wrong drive and he stated that it's the only one they stock and I was out of luck, despite the fact that their site lists both models. He was really a jerk about it. The point here is that the guide from iFixit, while very helpful, does not link the correct drive for the late 2009 27" iMac. The ST31000524AS will not work properly and the hard drive fan will rev up to 4.5k RPM or higher. Resetting the SMC or any other troubleshooting steps will not resolve the problem. These drives are different and they have different firmware.

ST31000524AS has Firmware JC45 and was linked in the iFixit guide as compatible with late 2009 27" iMacs

ST31000528AS has Firmware AP24 and is the actual drive that shipped with the late 2009 27" iMac

Do NOT buy the ST31000524AS drive if you have a late 2009 27" iMac. It will NOT work properly. I still think this is an awesome site, but in my opinion the guide needs to note these differences. I am now out almost $200 until I RMA two drives. In the meantime I am left booting from an external USB until I can find the correct replacement.  Can we possibly add an addendum to this guide [guide|1634] pointing out these differences? This has really been a pain in the butt and I wouldn't like to see anyone else go through this.

Thanks,

William

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open