

(Note: If after doing this a second dialog box appears saying "First Aid needs to temporarily lock the boot volume" Click Continue When prompted if you would like to run First Aid, click run.Select the Hard Drive you would like to check from the list of volumes.Open Disk Utility, which is in the Utilities folder within your applications folder.Repairing Disk Permissions with First Aid on OS X El Capitan and aboveįollow these steps in OS X El Capitan or above:

You can use first aid to do this manually for external hard drives. Beginning with OS X El Capitan, system file permissions are automatically protected, It's no longer necessary to verify or repair permissions with Disk Utility on OS X El Capitan and above, as this is done routinely on the start up disk. In OS X Yosemite and earlier, Disk Utility can be used to Verify and Repair disk permissions. You can see a file or folder's permissions in the Sharing & Permissions section of its Get Info window. If a file's permissions are no longer set correctly, software that uses the file (such as Serato DJ) might not work correctly. Thanks for reaching out to Apple Support Communities.Permissions are file settings that affect the ability to read, write, or execute (open or run) the file. Not all installers include a receipt with the files they install. The receipt tells Disk Utility what the permissions should be. To repair permissions, click Repair Disk Permissions.ĭisk Utility checks a file's permissions only if the file has a corresponding receipt in /var/db/receipts.


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.
