Mid-2010 MacBook Pro I recently placed an SSD into my optical drive bay, and installed OSX to it. I've also made it my main startup drive. I've backed up the old 500GB drive, and done what I wanted to do application wise. Attempting to wipe the main HDD I am told that OS X can't unmount the drive. I've restarted Finder, as another thread suggested with a similar issue, to no avail. Does anyone know why the drive won't unmount? Is it because it is in the main drive bay? Thanks!