2Open the Disk First Aid icon.
You may need to look in a folder called Utilities to find Disk First Aid.
3Click the icon of the disk you want to test.
Disk icons appear in a box at the top of the Disk First Aid window.
4Click Repair to begin testing and repairing the disk.
You can’t repair the startup disk or the disk that contains the Disk First Aid program, but you can test these disks by clicking Verify. If the program reveals a problem with either of these disks, start up the computer from another disk so that you can repair the damaged disk.
If you want to test and repair another disk, click its icon and then click Repair.
5When testing and repair are finished, choose Quit from the File menu.
