So, due to my Question Mark Folder of Death issue, I decided that since my computer is pretty old already, I need it to last me a little more, and I would be replacing the HD anyway, I would try to breath some new life into it by installing an SSD, as recommended by many. (And I'm hoping the issue really is just the HD itself and not the cable, but we'll cross that bridge if we get to it...) Since I couldn't really afford a huge SSD in such a short notice, I'm going to go with the SSD + HD configuration these older MBPs still allow by replacing the optical drive that has been dead for a while and I honestly never bothered replacing because I don't use, like, at all. My question is: Is there a recommended configuration for the drives? Aka. Does it make any difference where I install each inside the computer? If so, which one should go in the usual spot and which in the optical place? Any other recs since this is my first time with this configuration regarding anything at all, really? My plan is to run the OSX and apps on the SSD and keep the rest of the bulky files on the HD and I'm leaning against setting them up as a single Fusion Drive since I would very much like not to be royally screwed if either dies (what I've read tells me neither would be workable if one dies in a Fusion set up). Also, what's the deal with TRIM? I'm on a MBP mid-2009 15" running Yosemite. Thanks in advance for any help/advice!