Disk Utility 12.x: About disk defragmentation

This article has been archived and is no longer updated by Apple.
About disk defragmentation

You don’t need to defragment or optimize your disk when you use Mac OS X. When writing files, Mac OS X optimizes your disk space and avoids fragmenting large files into smaller segments.

If your hard disk seems to be slower than it used to be, you may need to repair your disk.

Repair a disk

Last Modified: Sep 3, 2015

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