Install Tricks for Double Drives on a Mac Mini. This Blog references upgrading Mac Mini 2011 to Late 2012 with double drives. If you want a video installation of the drives go to OWC at https://eshop.macsales.com/installvideos/mac_mini2012_server_hd/Macmini6-1-nonserver/
OR iFixit at
https://www.youtube.com/watch?v=2NORZR0BbZs.
Both installation videos are complete and helpful for the first-timer. But as a Mac Mini user (I have 4 of them with different operating systems), I have found the following procedure helpful and non-detrimental to the delicate ribbon cables inside the Mini. (I have learned through harsh experience how to inadvertently snap off the delicate fan or IR holder on the mother board. And buying an older machine, say on Ebay, can get you a machine with inside fragile parts that tend to snap off when using the video based installation procedures.) So, here you go.
Unless you are constantly moving the Mini, this procedure will save you from either ruining the fan cable or logic board fan cable holder. You will not have to essentially take the Mini apart, put it back together, and hope that all goes well.
I have used this procedure many times and have found it to be an acceptable alternative to the traditional video procedures. If you have any questions please email me at cshanktype@gmail.com.
NOTES:
• If using a Mac OS 10.8.x see https://eshop.macsales.com/blog/15619-special-note-for-adding-an-ssd-to-a-2012-mac-mini/#comment-61641 for necessary cautions.
• SSDs are recommended to replace older hard drives. OWC has a number of options here at macsales.com.
• You still need a Data Double kit for the SATA cables required.