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10.5: An easy way to defragment a drive's free space System 10.5
If you wish to defragment free space on a drive here's how to do it quite easily.

Using Disk Utility, repartition your drive, giving the strict minimum space required for the original volume, and then create a second volume with the remaining available space. This takes time, as all your data will be joined on the volume that is resized but not erased. Then when finished, get rid of the volume you just created, giving back all available space to the original volume. This part is fast. That's it; you're done.

[robg adds: I haven't tested this one, but 10.5's Disk Utility will supposedly allow partitioning without erasing the existing data. If you're going to try this hint, I strongly suggest you have a good backup first, just in case things go wrong. Note that Apple states most users do not need to defragment -- there will be little benefit to the typical user, thanks to OS X's built-in tools to handle fragmentation.]
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10.5: An easy way to defragment a drive's free space | 4 comments | Create New Account
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RobG- I think he meant "free space" specifically
Authored by: Lectrick on Dec 18, '07 09:37:47AM
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.)

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

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RobG- I think he meant "free space" specifically
Authored by: robg on Dec 18, '07 10:10:52AM

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.


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Russian roulette anyone?
Authored by: alec kinnear on Dec 18, '07 05:57:26PM

Surely there are easier and more entertaining ways to earn oneself a night or two restoring one's system from scratch.


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10.5: An easy way to defragment a drive's free space
Authored by: pedz on Dec 19, '07 06:11:13AM

Its interesting that the "you don't need to defrag" article failed to mention the BSD file system. For the most part, as of BSD 4.2, a Unix file system rarely needs defragmenting. I've used Unix since '82 and never defragmented a file system.

A Fast File System for UNIX is an interesting read.

While HFS is not the BSD file system, I'd be surprised if it doesn't use the same concepts it developed.

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