Running an Early 2011 MBP 13" 16 GB Ram 512 GB Samsung 840 Pro SSD in Main bay Old stock 320 GB HDD via OWS Data Doubler in place of Optical Drive My old HDD still has some old data and OS Mt. Lion running since before I used it to clone it to my SSD. I tried booting from it and wanted to transfer some stuff from iPhotos but it became so unresponsive, very slow. I want to eventually completely reformat it so I can just use it to store media/docs/etc. but was wondering if it will become unresponsive as it is now? I also had some question about the 3 Gb/s and 6 Gb/s Sata for my optical drive. I know the Main bay can hold and run 6 Gb/s perfectly fine, but it is showing this for my HDD in the optical drive: Vendor: Intel Product: 6 Series Chipset Link Speed: 6 Gigabit Negotiated Link Speed: 3 Gigabit Physical Interconnect: SATA Description: AHCI Version 1.30 Supported Does this mean my optical drive can only run at 3 Gb/s or Is it probably because my HDD can only run at 3 Gb/s? Not sure how much of a difference it will make.