Hi I am currently trying to install Yosemite and I wanted to partition my Macintosh HD but I get the error: "Partition failed with error: Couldn't modify partition map because file system verification failed." I have a 512 GB disk with 120 GB dedicated to Bootcamp and the rest is Macintosh HD at the moment. Is it Bootcamp that is causing the problem or is it something else? Is there an easy solution? Edit: I have a 2013 13" rMBP running Mavericks.