I've had my Macbook Unibody late 2008 since its very launch and have upgraded various parts over the years, e.g.: -a new battery -2 x 4GB DDR3 memory -320GB 7200 RPM hard disk -charger Although it has crossed my mind to replace this machine, but it would only be a waste of money as it still functions well (although I'd love the battery to last longer than 3 hours). The only problem left is a lack of hard disk space and therefore, I'm considering to buy a Samsung 256GB 840 SSD to be used in combination with my current 320GB hard disk (I know that macbook doesn't support SATA III, but should I decide to buy a new macbook in the future, this SSD will be migrated.) I've got a few questions I would appreciate your feedback on. Firstly, the hard disk bay shows a SATA link speed of 3GB as well as a negotiated link speed of 3GB. Although the superdrive shows 3GB of link speed, it only has 1,5GB of negotiated link speed. What does this concretely mean for speed, can both the optical bay and the hard disk bay reach SATA II speed? Hence, if I decide to buy a SSD, should I put my hard disk or SSD in the super drive's optical bay?