Access Disk Utilities on a Macintosh

Step by Step

  1. If you're using OS X Lion (10.7) or later, start the computer from Recovery System or Internet Recovery. To start your Macintosh computer from Recovery, restart your computer and hold down the Command and R keys at startup. You need to have a connection to the Internet to do this. If you're using an older version of OS X and your computer came with a Mac OS X Install disc, insert the installation disc and restart the computer while holding the C key instead.
  2. When the Installing OS X screen appears, click Utilities from the Menu bar.
  3. Click Disk Utility.
  4. Click the hard drive you want to check.


There are various options you can choose when using the Disk Utility

  • S.M.A.R.T. Status: Self-Monitoring, Analysis, and Reporting Technology, or S.M.A.R.T., is a monitoring system for hard drives that detects and reports on various indicators of reliability, in the hope of anticipating failures. Disk Utility displays this information. If your hard drive is functioning properly, the status will be Verified. If it is failing, you will see this information in red letters and the hard drive will most likely need to be replaced.
  • Repair Permissions: Sometimes the permissions (read, write, etc.) associated with the files on your hard drive can become incorrect. This utility will attempt to repair them. Click the Repair Permissions button to begin the repair. When it is finished, restart your computer as you normally would to see if the problem has been corrected. If not, follow the instructions above to return to Disk Utility and run Repair Disk.
  • Repair Disk: This utility inspects and repairs the files and directory structure on the hard drive. Click the Repair Disk button to begin the repair. When it is finished, restart your computer as you normally would.


Article ID: 64838
Tue 10/9/18 12:25 PM
Mon 11/11/19 3:00 PM