As indicated in the screenshot I can't increase the size of the main partition.

enter image description here

  • You can't unmount the disk you're booted from. – Tetsujin May 26 '16 at 16:39
  • 1
    You should edit your question/title so that they are congruent because it's unclear what you are asking. Your screenshot indicates you can't unmount the partition you booted from, not that you can't resize it. To resize a partition, you need to boot from a different drive/partition. – Allan May 26 '16 at 17:36
  • yes , thank u , but how to unmount these – osama May 27 '16 at 13:26
  • after that I want to increase (machintosh HD) – osama May 27 '16 at 13:33

Try the following steps:

  1. Shut down the computer and reboot it while pressing Alt/Option.
  2. In the boot picker choose your recovery partition (name can vary, depending on your language settings).
  3. In the recovery partition launch disc utility and perform the steps you tried already.
  • I can not log in to the recovery, when you click on the recovery waited a long time without result ٫Thank u for your efforts – osama May 27 '16 at 13:23
  • Try to boot while holding down Cmd+R for recovery. Refer to support.apple.com/en-us/HT201314 for more help. – schoeM May 28 '16 at 8:12
  • Yes, I tried, but did,t show recovery – osama May 28 '16 at 9:37
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    Try Cmd+Option+R for Internet recovery. There are some cases that a computer can run without a working recovery partition. – schoeM May 28 '16 at 12:57
  • Yes, I tried, but did,t show recovery – osama Jun 22 '16 at 13:27

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