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iMac Intel 27インチ EMC 2309 (Late 2009, Core 2 Duo 3.06もしくは3.33 GHz) ID iMac10,1, EMC 2374 (Late 2009, Core i5 2.66 GHzもしくは Core i7 2.8 GHz) ID iMac11,1

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System not recognizing the new drive

This system is a late 2009 27” iMac. I”m not sure of the exact EMC / CPU.

I replaced the drive with Seagate 2TB FireCuda Gaming SSHD SATA 6Gb/s Flash Accelerated (8GB) Performance Hard Drive

I purchased the OWC In-line Digital Thermal Sensor from

Full disclosure i ruined the display cable removing it from the system. So i purchased this replacement from ebay

593-1281 593-1028 922-9168 LVDS Display Cable For iMac 27" A1312 2009 2010

Put it all together and gave it a hard reset (ctrl opt P R) and it boots to a white screen with a mouse that can be moved.

It wont boot to Option R to get to my time machine. But it did recognize my Leopard usb drive that i created from my DVD. But when attempting to boot from it, i get the flashing ?folder icon. Also holding down just Option doesn’t show attached usb hd’s.

To me it seems like the system is not recognizing the SSHD. What else can be done to get the system to see the SSHD?

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The 2009 has a sata ll limitation 3gb/s, so your actual speed after overhead will only be around 225mb/s... Did you try booting into safe mode?


I've used an SSD plugged into a usb port to gain access when locked out also used target mode as well for other problems.


There's also a terminal hack to get it to recognise your drive it can be as simple as it not being properly formatted so I've been told. You have to first boot into verbose mode use the check disk command and from there go to disk utility and format your drive and install your operating system from the internet... I'm not sure what the proper commands are but you should be able to google them, the language will be UNIX I think... I found it... you may have to enter the command line by using verbose mode … This should fix your problem.



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Exact information on your machine is printed on the bottom of the stand.

The 2009 does not need the OWC sensor.

However it did use three different hard drive temperature sensor cables according to the specific drive.

922-9223 Hitachi

922-9224 Seagate

922-9225 Western Digital

Hard drive: Your machine has a Serial ATA (3 Gb/s) bus, so check to see if the drives you are trying are backward compatible to SATA II.

Try booting up from your original system installation disk by inserting the disk on boot up and holding down the “C” key. If you can see the drive in Disk Utility format it GUID MacOS Extended. Now you should be able to install a system.


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Bill Narbert さん、ありがとうございました!

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