Disk utility partition fail caused my disk to fill up with... nothing?
So today I was working on partitionating my disk in half. But when I was about 50% ready with doing so. I quit the partitionation (by clicking the red circle in the top left and clicking quit) and wanted to try it again because I figured I had vergot to set it to MS-DOS. The next time I tried, my disk was filled up... with nothing! Something was occupying space. So I opened up DaisyDisk. (A visualisation of your disk helping you to clean up your files with ease) (http://www.daisydiskapp.com/) but I had a timeout error. I was also unable to eject the disk. I tried to use the disk repair utillity but it said everything was fine. So I restarted my computer. Didn't help. So I plugged out the disk, put it in again and repeated the process.
What is occupying this space?
EDIT: I tried again, this time it did show up. but still no help ( http://gyazo.com/583b7fb3664806610b1df6d07ea5fd07.png )
MacBook Air, OS X Mavericks (10.9)