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Model A1347. Released on October 23, 2012. Core i5 or Core i7 Processor. Apple Fusion Drive.

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What is additional connector on logic board for?

What is that unused connector for? I have no idea. I saw it while cleaning my mac mini Mid 2012.

I know that there is another port for second drive, I have no idea what is purpose of this one

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Apple often has diagnostic ports for testing systems during the assembly process. As it's not documented in their service manuals I would suspect thats what it is.

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