How do you fix imac disk defragmentation? I used Drive Genius 3 and the same things keep coming back as fragmented.

How do you repair disk defragmentation on an imac? I tried with Drive Genius 3 and after completion the same defrag keeps showing up.

Disk fragmentation and particularly whether it can be fixed, is very controversial.  The following thread is worth reading:
https://discussions.apple.com/thread/3327627?start=0&tstart=0
I think it's true that disks can become fragmented, and this can affect performance. However it is also said that the OS X file system attempts to address this issue in the background all the time, apparently for certain sizes of files in particular.
In my experience the biggest problem is actually lack of disk space.  If you don't have a fair amount of free space on your drive, tinkering with the fragments won't help much if your system needs to create a swap file or do some other maintenance.  So my recommendation is that you follow the advice to clone and re-create your drive, but if you have limited free space, consider upgrading the disk or the entire computer in the longer term.
Hope that's helpful.
Ivan

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