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モデル番号A1312 / Mid 2011 / 2.7 & 3.1 GHz Core i5もしくは 3.4 GHz Core i7 Processor, ID iMac12,2

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Does the thunderbolt of this model of iMac work for external storage?

My iMac is the model of iMac Intel 27" EMC 2429, mid 2011, which has 2 thunderbolt ports (yes, I cofirmed it is thunderbolt), which I have never tried to use until now. I tried the thunderbolt converting to VGA and it works fine. However, when I connect the imac to an external storage or converting it to USB 3.0, it does NOT work. The cable has no problem. It is a brand new cable bought from apple store, and it works fine on another mac book air.

My question is, does the thunderbolt of this model of iMac really support external storage? Or it is my thunderbolt ports have some problem? I asked apple support, they said all thunderbolt ports should work for external storage inclusing this model.

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I have two native Thunderbolt drives hanging off of my 27" iMac of the same series.

So you either have a bad Thunderbolt adapter or there is something wrong with your logic board.

I would start by getting a native Thunderbolt drive to try out if it works then the adapter is bad.

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@danj I don't have a native Thunderbolt drive, but I tried to connect my imac with another mac air, which runs on target disk mode. it didn't work. And the adaptor works fine on another mac. so, it must be the logic board problem, but i need to confirm this type of imac does support thunderbolt storage before i go ahead to buy a second hand logical board. Is your imac mid 2011 27"? 2011 is important because it is the first imac which supports thunderbolt. so i wonder if apple does not really support storage in their first vrrsion of thunderbolt.

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Confirmed! It supports external drives, thats its primary role. Again, I have the exact same model as you do for my home system (mid 2011).

All Thunderbolt ports support both drives and displays. The only issue here is the older displayPort looks the same so make sure your's has the lightning-bolt symbol above it in case you've mis-identified your system here.

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@danj is right, the model should work fine with external storage, especially if the same adapter and thunderbolt cable work on a different mac.

It may not work, but resetting you PRAM is worth a shot to see if it'll kick your thunderbolt port back into gear. Shut down the computer, hold down Shift+Command+P+R and press the power button. The computer should start up and chime, then shut off again. I always keep holding the four keys down until it goes through this process four time (just for good measure).

Let us know if this works, or if you find another solution!

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@munkeyhunk I confirm the adaptor and cable have no problem. I reset PRAM (a couple of resetting not 4 times). it didn'twork.

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@kaykay this one slowly creeped over 500

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Frank さん、ありがとうございました！
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