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I am running OSX Yosemite. I had free space on my partition, (see picture below) but now it wont delete. I change the format to Mac OS Extended (Journaled), and then when I hit the " + " button it loads for about 1/100 of a second, and then shows on the screen that it partitioned it. When I click away from the partition tab onto the first aid tab, it goes away and becomes free space again. (NOTE: I am trying to MERGE the free space with my first partition, not make a new partition, but i have to make a new one to merge it with my first partition.) Before Hitting " + " Button After Hitting " + " Button What The Log Says After Hitting " + " Button

marked as duplicate by Tetsujin, Ruskes, jherran, Matthieu Riegler, Graham Miln Feb 3 '15 at 16:02

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  • Are you using filevault encryption? – n1000 Feb 3 '15 at 7:46
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If you boot into the recovery partition (hold down option on boot) - and select the disk utility from the utility menu (do not reinstall OS X) you should then be able to resize the partition.

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