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# Error while checking the Startup Disk

If OnyX detects an error while verifying the structure of the disk, be sure to repair it as soon as possible.

## To repair a disk:

Quit OnyX.

Insert the Mac OS X Install disc. Restart the computer. Hold the C key after the start-chime (thus forcing a restart from the system DVD).

Select your language.

In the Utilities menu, choose Disk Utility.

In the left column, select your startup disk.

In the S.O.S. tab located at right, click the Repair Disk button and wait.

Then restart normally...

Most of the time, the errors are not necessarily anything serious and they are usually corrected by Disk Utility. Nevertheless, more serious errors can require that you use a third party application (Drive Genius, DiskWarrior, TechTool Pro...).

### Related Topics

Verify the startup volume