==== EDIT === As SPINK10 notes below, the 3 Gigibit speed IS the slower speed, so disregard. : ) Hey all... I was under the impression that the optical bay SATA was limited to 1.5 Gigibit negotiated link speed in the early 2011 MacBook Pro's (mine is a 13"), as well as possibly other 2011's. I just put a Crucial M4 in there and now System Info is showing 3 Gigibit negotiated link speed. Maybe I've been looking at the wrong threads, but I have not expected this at all and am pleasantly surprised. So I post this here for FYI for whomever it may help and for general interest.