I have a 128GB Crucial M4 in the main bay of my 2011 13" MBP. I have the stock 320GB HDD in an optibay. All my boot files/applications/data was copied with Carbon Copy Cloner to my SSD from my HDD. The M4 has been set as my boot drive, however, while using my laptop, the HDD still seems to spin. For example, sometimes when I quit an application after leaving my MBP idle for a while, the HDD needs to spin up before it actually quits. I'm not completely sure why this is happening, considering everything is on my SSD. Any suggestions?