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If you have problems with your Mac disk
The following issues may be related to your hard disk:
Multiple apps quit unexpectedly
Files become corrupt
An external drive does not operate properly
Your computer doesn’t start up
If you have problems with your hard disk, you may be able to repair it using Disk Utility.
See the Repair a disk topic in the Disk Utility User Guide.
See alsoIf a disk can’t be repaired