I've been researching SSD upgrades/optibays to improve my mid-2012 cMBP 15" for the last few days before taking the plunge. I just had a few questions I was hoping someone might help me with and whose answers others might find helpful: This optibay http://www.amazon.co.uk/gp/product/...act_title_1?ie=UTF8&psc=1&smid=A26S1IMFVEEDLD says it runs with SATA III yet I was given to understand the negotiated link speed is based on the chipset/logic board controllers. Would it be better to buy any old optibay or for maximum performance should I get the aforementioned? I'm torn between getting the Samsung 840 EVO (Amazon has a great deal on it at the moment) or the Toshiba THNSNJxxxGBSU / THNSNJxxxGCSU https://storage.toshiba.eu/cms/en/hdd/product_overview/product_detail.jsp?productid=615 . I've heard a lot of great things about both, the only reason I would go with the Toshiba is it's newer technology having been released earlier this year. Finally, in order to get the best benefits of using my mechanical drive and the SSD in tandem, would it be best to keep the mechanical HDD in the HDD bay so that I can take advantage of the Sudden Motion Sensor and the SSD in the optibay, or should I put the SSD in the HDD bay so that I get the maximum read/write speeds? I know this was an issue in the 2011 MBPs but I've heard for the 2012s both SATA links run at 6GBps. Phew! If anyone could give insight into any or all of these questions I'd be much obliged.