Section 5- Disk First Aid
Disk Utility
If your computer has been freezing or if you have been experiencing error messages, run Disk Utility’s First Aid. First Aid is a utility application that checks your hard disk and repairs minor directory damage caused by crashes and other problems. To run First Aid:
- Open the Applications folder and then the Utilities folder -OR- Select Utilities from the Go menu.
- Launch Disk Utility.
- By default the First Aid tab is selected.
- Then select the disk you want to repair on the left.
- For your boot disk (the one with your operating system) you can only run Repair Disk Permissions.
- For other disks you can only run Repair Disk.
- If you want to run Repair Disk on the hard drive with your operating system you will need to boot from another source such as a system CD or DVD or an another hard drive.

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