Mac Free Space

I partitioned my MacBook Pro into 2 volumes so I could dual boot Mavericks and Yosemite Developer Preview. After testing Yosemite, I found out that it was stable enough to run on my main partition. I installed it on my main partition replacing Mavericks and deleted the second partition which included Yosemite. While deleting, somehow I was left with an empty partition called 'Free Space' which I cannot delete.

An easier way to reduce the amount of space Xcode uses. CleanMyMac X has several tools that make it easy to free up space on your Mac. One of them is System Junk. It identifies files like language files you don’t use, user cache files, old updates, and other junk files put on your Mac by the system. Here’s how to use it. The best way to gain extra space on the Mac is to move non-executable files such as photos, movies, documents, and any large files, to add external storage, for example, an external drive, USB drive, DVD/CD drive, or cloud storage. Back to Table of Contents Compress large items. Another method to obtain some free space is to compress files. DaisyDisk check & freeing up disk space on Mac computer with efficiency and simplicity. This is mainly because it has a beautiful interface, presented in the manner of an interactive wheel for easy and intuitive visualization. DaisyDisk is very fast, and shows an overview of all disks connected to the Mac. Open the Apple menu, then select About This Mac. Click the Storage tab in the toolbar to see how much disk space you have available. (On OS X Mountain Lion or Mavericks, click the More info. The Competition: Even more Free Mac games to download. This is a very big list we’ve put together for you, but not big enough to cover everything. As more games are made available for free in an effort to draw gamers into their community, there’s more we have to look at.

I am pretty sure the problem isn't related to Yosemite being a developer preview as it could've happened under an previous stable OS. How can I merge my 'Free Space' partition with Macintosh HD?