Disk Utility can verify your computer’s startup disk (volume) without starting up from another volume. This feature is called “Live Verification.” If Disk Utility discovers any issues that require a repair, you will need to start up from your Mac OS X Install DVD and use Disk Utility on that disc to make repairs. (You can’t repair your startup volume while your computer is started from it.) This article applies to Mac OS X v10.4.3 and later.

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Using Disk Utility to verify or repair disks

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