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To check permissions, click Verify Disk Permissions.Select the startup disk from the list of volumes.Open Disk Utility, which is in the Utilities folder of your Applications folder.It's no longer necessary to verify or repair permissions with Disk Utility.įollow these steps in OS X Yosemite or earlier: You can see a file's permissions in the Sharing & Permissions section of its Get Info window.īeginning with OS X El Capitan, system file permissions are automatically protected. If a file's permissions are no longer set correctly, software that uses the file might not work correctly. Permissions are file settings that affect the ability to read, write, or execute (open or run) the file. In OS X Yosemite and earlier, Disk Utility can repair file permissions on a startup disk. Repair disk permissions with Disk Utility One thing to make sure of is to select the Start Up disk from the list of volumes as indicated in the following Knowledge Base article: It seems you are not seeing the option for "repair disk permissions" in Disk Utility on your Mac running Mac OS X Yosemite.