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My 21" has a Seagate, but Apple doesn't spec out drives from one specific vendor. Any given iMac could have any brand of drive...whatever was available when it was being built. I think the exception to the rule is MPs have WD Black drives, nothing less.
 
My 21" has a Seagate, but Apple doesn't spec out drives from one specific vendor. Any given iMac could have any brand of drive...
I'm surprised that Apple would be mixing drives from multiple vendors on what is currently a fairly restrained production run. Are you really talking about the late 2012 iMac?

Will be interested to learn what drives the 27" model has.
 
Well my 3TB Fusion arrived today and it's a Seagate Barracuda ST3000DM001.

I read reviews elsewhere saying they are noisy but I have yet to hear any noise whatsoever from the iMac, it's so quiet you could hear a pin drop.

Another review of the Seagate 3TB.
 
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