How to verify and repair Mac OS X Disk Permissions - iFixit Repair Guide

If your mac is having trouble recognizing a replacement battery or other components, you may need to repair your main disk permissions. Follow this

How to repair a Mac disk with Disk Utility - Apple Support

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How to repair a Mac disk with Disk Utility - Apple Support

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Understanding Mac OS X Disk Permissions, and How to Repair

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Tech Tip: How to repair disk permissions on a Mac

How to Repair Disk Permissions on Mac OS