MBP 13" early 2011. Last year I bought an SSD and changed out my optical drive for a (an?) SSD. Used CCC to transfer programs apps etc. onto the new SSD, set that up as the start up disk in system preferences. Question. Can I now delete OSX from the original hard drive (still in the MBP) or does it need to be there to "do something" ? I'd like to free up the space for storage and use the SSD for start up etc. and have the hard drive for files, music, documents etc. As an alternative should I swap the two locations around and put the SSD where the hard drive is and the hard drive in the optical bay, would that make a difference ?