Indiana University
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Using Disk Utility in Mac OS X

In Mac OS X, Disk Utility is a multipurpose program for working with hard disks, disk images, CDs, and DVDs. Depending on your version of Mac OS X, you can use Disk Utility to perform the following functions:

  • Erase, format, and partition hard disks and rewritable CDs and DVDs
  • Run First Aid, a function that repairs file systems and file permissions
  • Stripe or mirror disks in a RAID
  • Mount, create, and modify disk images, as well as write or burn them to disks, CDs, and DVDs
  • Manually eject removable media when other methods fail

Disk Utility is in the Utilities folder inside the main Applications folder. It is also available on Mac OS X software installation CDs and DVDs, and, in Mac OS X 10.7 (Lion) or later, on your Recovery HD volume. For more about using Disk Utility, from Disk Utility's Help menu, select Disk Utility Help.