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Is Defrag necassary and if so what utilities are recommended

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Short answer for readers revisiting this old thread: in most cases you do not need to manually defragment a Mac today. The platform, filesystem, and common hardware changed since 2008–2009, so the practical advice in this thread needs an update — and were right for their era, and ’s relief about fewer crashes still rings true. (macworld.com)

Why: older HFS+ volumes include features (delayed allocation, a metadata “hot files” area and on‑the‑fly coalescing of small files) that greatly reduce fragmentation; APFS (the modern Apple File System introduced with High Sierra) is designed for flash/SSD use and doesn’t benefit from traditional defragging. Manual defragmentation tools are generally unnecessary and, for APFS/SSDs, either unsupported or counterproductive. See Apple’s APFS guidance and HFS+ technical notes for the implementation details. (developer.apple.com)

Practical, safe checklist (apply these before thinking about any defrag tool):

  • Confirm drive type and free space: diskutil info / and df -h / are quick checks.
  • Run Disk Utility > First Aid and check SMART/drive health.
  • If the disk is an SSD (Solid State), do not defragment — TRIM and the file system handle wear and layout.
  • If you have an old mechanical HDD, are frequently editing many huge files (VM images, long video projects), and the volume is very full (<~10% free), you might see benefit from a one‑time optimization — but only after a full backup. For APFS volumes, most optimization tools do not and cannot rearrange data safely. (macworld.com)

Bottom line: for modern macOS (APFS + SSDs) leave it to the OS; for legacy spinning drives with a heavy large‑file workflow, back up, run diagnostics, and consider a safe rebuild/clone-and-restore rather than routine third‑party defragging. (macworld.com)

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Member Avatar for John A

HFS+ is a filesystem that's designed so that it shouldn't need to defragged. However, if you really need it (normal usage won't need it), iDefrag is available, although it's not free. And of course, the best way to clean up a filesystem is to wipe it and start from scratch. In short, don't worry about defragging unless you experience serious slowdown problems related to your filesystem.

Member Avatar for RockyOne

Whew! Now I don't feel so guilty..Remembering back to my days in Photoshop 3.0 I think we had to do the d/f thing..Used to have plenty of crashes in those days..Love the OS X system..Crashes! Almost a thing of the past..Thanks again..RockyOne Australia

Member Avatar for johnlh

Is Defrag necassary and if so what utilities are recommended

At some point your computer will begin to slow down if you never defrag your HD. Remember not matter what you use to defrag you should ALWAYS backup you complete HD before doing this as if the computer shuts down for some reason like a power outage you could mess up you entire HD. You can Defrag with TechTool Pro, Drive Genius and others but those are the two I prefer. I do this about three times a year. Depending on how much info you have on your HD and how much you use your computer will determine how much fragmentation you can develop. It can take hours to do this if you have a big HD or perhaps only an hour with a typical user. Once your start defraging do not mess with the computer until it has finished and BACKUP before you start.

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