I have the same iMac 27" i7 mid-2011 and it is new to me, refurbished, with an extended 2 yr. warranty. When purchased, according to the specs only had a 1 tb HDD. The NICE surprise is it also shows a 256gb Apple SSD TS256C installed (along with 8gb < 16 gb RAM and 1gb <2gb RAM on the video card - all surprise upgrades from Mac of all Trades! ISSUE IS: On both hard drives it shows Link Speed = 6 Gigabit Negotiated Link Speed = 3 gigabit NOW... could this be reconfigured through a software solution, to run as fast as it should?? Update (01.08.2018): Again- On both hard drives it shows: Link Speed = 6 Gigabit HOWEVER it shows a Negotiated Link Speed = 3 gigabit ...So clearly if two out of the three cables are supplying 6 GP/S And the link speed reads an initial 6 GP/S on both HDD and SSD.... It would appear that they each have the proper port for that part of the configuration ( if one of them was in the optical Port, a starting link speed of 3GP/S, not 6, would show as the link speed) - then there must be a...