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No problems whatsoever. M9T is part of Fusion, so ssd already in. New sshd was too fast to be hdd part of Fusion, so I had to downgrade.
I know I'm weird, but I like to know tech specs of my devices, even if I don't have any problems. Just to avoid problems ahead. When I installed M9T I wasn't sure if it would work in mini2012. I ordered the 1.75TB version and Seagate's (outsourced monkey)support couldn't find any specs or docs about it. Luckily I got the 2TB version.
 
That looks like 3.5 inch drive info. I have not noticed jumpers on an SATA laptop drive before. Interesting to see if it works for you.

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The point is that although the spec is 6G it doesn't reliably work with 6G devices, because Apple only intended it to work with a 1.5G optical drive.

Google "6G in optical bay MBP" for more, but here is a recent thread which may help.

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The comment about "problems solved" on that link is referring to problems that some early MBPs had with 6G in the main bay. If you read on in that link you will find:

"#2 – For those with a MacBook Pro 15″ or 17″ model that has SATA 3.0 6Gb/s link capability reported, it is very important to note that this EFI update does not appear to have resolved reliability of using a 6Gb/s drive in the optical bay. If you have a 6Gb/s optical drive bay connnection and are using a product like our Data Doubler, we still recommend only using a SATA 2.0 3Gb/s drive in that bay. MacBook Pro 13″ owners who find 6Gb/s links in their optical bay are not experiencing issues with 6Gb/s drives and this update doesn’t affect that usage."

The issue you guys are seeing with the 2011 is an Intel Sandy Bridge chipset issue with SATA-3 that was a big deal back in the day. It led to a chipset recall and delay for many OEMs

https://www.anandtech.com/show/4142/intel-discovers-bug-in-6series-chipset-begins-recall

I think I remember reading that Apple decided to go with the affected chipsets anyway, to meet their own timelines for the 2011 MBP. The bug was not considered impacting to Apple because the DVD drive hanging off the affected SATA port was only a SATA-2 device.
 
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