![]() ![]() The HFS+ filesystem directory / catalog itself can become fragmented over a long time but you can fix that easily. Mac OS X automatically defragments files that are likely to cause a slowdown in addition to automatically optimizing hot (often used) files to a fast and not-fragmented part of the drive. There aren't many apps that do this on mac since actual filesystem fragmentation both rare and rarely a cause of measurable slowdown. You don’t need to rearrange the files on the drive as macOS does that for you - just keep 20 GB free or 25% free if you can, and the system optimizes the file location automatically. ![]() ![]() It rebuilds the catalog (filesystem) that tracks the files. On APFS - you don’t need to defragment anything.
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