Hey there! Hoping you guys can help me, new to posting in the forum but have been an observer for many years I currently have a Macbook Pro9,2 - Mid 2012 13 2.5GHz i5 8GB RAM. The default hard drive is slowing down in life, plus I have been doing more video editing with the video files taking up more space, so I decided to invest in an SSD and a HDD, with the plan of removing the optimal drive bay, and installing both. Currently: 500GB APPLE HDD HTS547550A9E384 Upgrade: 250GB Samsung 850 EVO SSD 1TB Hitachi HTS721010A9E630 Travelstar 7K1000 In addition, I have an external enclosure (The idea being I will put the original 500gb drive in it) and an external drive bay enclosure for the MBP superdrive. Also I have tools for disassembly etc. Now I have found many many guides for installing straight from a hdd to an ssd but not so much for a split from hdd to a ssd and hdd. To make things even more complex I was hoping to do a clean install of the OS, choosing which files to take with me (I migrated the past TWO macs I had, so it is definitely time for a clean refresh I thought?). It may sound stupid but I dont know the best way to do this. If people could give me there thoughts/plan of attack I would greatly appreciate it. Also, how people would split the what goes to the ssd and what to the hdd! You guys are awesome so I look forward to your response; I feel like Im Apollo 13 and you guys are Ground Control creating me a CO2 filter out of my equipment! Many thanks and let me know if I'm missing any info out and I will update. Thanks again guys!