I created new partition to install new OS X Yosemite. I didnt like that raw buggy sht and deleted it by erasing partition in Disk Utility. Now I have ~20 GB of unused free space and I need them. Somehow I cant add new partition by Disk Utility. When I click on «+» and add new partition and then click «Apply» nothing happens. Heres a screenshot of my HD. As you can see I also dont have resizing triangle there. Is there a way to somehow create new partition without formatting the whole HD and then merge two partition in Disk Utility? Or somehow resize this main partition?