Chosen Solution
Adding an eSATA port in a mid2010 iMac was announced just a little after the iMac came out and here is an article regarding this at the time… https://www.macworld.com/article/1151094… Problem is that i cannot find any relative how to video, nor some other info on how to do this right… i wish iFixit could do this :-)
There really is no secret here! The 2010 27” model has three SATA ports.
Back side of the 2010 27” logic board All OWC did is design a custom mini-SATA (logic board side) to eSATA cable which is mounted into the port in the logic board and the RAM access door. Don’t forget this system only has a SATA II (3.0 Gb/s) interface so you can encounter issues with SATA III (6.0 Gb/s) drives (fixed). If the drives spec sheet doesn’t list SATA II (3.0 Gb/s) compatibility don’t use it! eSATA really didn’t get any traction as OS-X (or even Windows) can’t handle loosing access to a drive before properly dismounting. and even eSATA is not without issues with static discharge!
