The wording on the title is a little off- while defragmenting files has become largely unnecessary with auto-defrag, it may still in some instances be valuable to defrag the free space on a volume in order to remove the possibility of an additional performance bottleneck with the creation of certain kinds of very large files (VM type swap files come to mind, as do VM files themselves made by the likes of Fusion, Parallels, etc.)

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In /dev/null, no one can hear you scream

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Probably so -- I'll leave the comment attached, in case others may think it applies to non-free space, but I'll edit the title of the hint.

-rob.

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