Oh man that was harder than I expected, anyways I have successfully installed the SSD and put back my original 500GB inside. After installing the Mavericks, I have chosen the option to create my fusion drive. Everything is working fine except... there are random freezes that I cannot control. I thought at first Mavericks is doing indexing (or something similar) for the first time so some freezes are normal. However after running for 3-4 hours, I still experience some freezes. Has anyone experienced this before? Just for reference, I am using Crucial M4 128GB SSD and my Mini is 2012 Mini.