Split Macintosh HD into 3 At the moment I have 1 250GB partition on my mac (Macintosh HD).

What I want to do is split my hard drive into 3 partitions. This is because I want to dual boot with Windows 8.1 and make a reserve drive for when El Capitan comes out so I can test it without my computer becoming buggy. The only issue is I can only split my Mac into 2 partitions. How would I do this? I also tried doing this in recovery mode and it did not work. Would I have to use a 3rd party tool like GParted? If so would it be safe and would I loose my recovery partitions if I do?
Thanks to @tubedogg for linking me to this post and giving me the tips.

To fix the issue I had to run the commands diskutil cs revert &lt;disk id&gt; and diskutil cs resizeStack (Not sure if that worked since I think it game me an error).

I had to reboot for the effects to change and I partitioned my drive in recovery mode (think you can do it within OS X though).