Note: for Mac OS X 10.11 El Capitan and later, please see this updated post instead. (Edited/clarified Nov. 2012, Nov. 2013, Jan 2015 and June 2016) The story is this - a while ago I replaced the built-in optical disk drive in my MacBook Pro 17" by an OptiBay (in the meantime, there are also alternatives) which allows to connect a second harddrive, or in my case, a SSD. To be able to continue usin