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====Retroactive techniques====
Retroactive techniques attempt to reduce fragmentation, or the negative effects of fragmentation, after it has occurred. Many file systems provide [[defragmentation]] tools, which attempt to reorder fragments of files, and often also increase [[locality of reference]] by keeping smaller files in [[file directory|directories]], or directory trees, close to each other on the disk.
The [[HFS Plus]] file system transparently defragments files that are less than 20 [[MiB]] in size and contain more than 8 fragments, when the files are opened.<ref name=osx-intern>{{cite book |author=Amit Singh |date=2006-06-19 |title=Mac OS X Internals: A Systems Approach |publisher=[[Addison Wesley]] |chapter=The HFS Plus File System }}</ref>
==See also==
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