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Old 01-24-2009, 05:21 PM   #1
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Defragging free space?

I know some or most of you have heard of the program Defraggler, by the makers of CCleaner. It has an advanced option to defrag free space. Is that even possible and if so, what advantages or disadvantages might it have?
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Old 01-24-2009, 05:31 PM   #2
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Yes it is possible and that option is offered by most disc defragmenting softwares.
Does it help? I don't know but i do it.
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Old 01-25-2009, 01:21 AM   #3
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What it does is consolidate all the free space it can, putting all the files it can in one contiguous block on the drive.
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Old 01-25-2009, 06:12 AM   #4
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Having the free space consolidated helps reduce file fragmentation, as the data doesnt have to be split up to fill the free space.
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Old 01-25-2009, 09:09 AM   #5
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I was thinking along those lines but just wanted to make sure. I recommended it to someone else and they raised an eyebrow at it. I just wanted to be sure I knew what I was talking about.
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Old 01-26-2009, 01:09 AM   #6
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smokin

Consolidating free space has it's pros and cons.
Pros
-faster file read because files are near each other
-faster file writes for new files
So, it's good for volumes where the files are relatively static.

Cons
-any file within the consolidated block will fragment if it is modified because it has no space to grow contiguously
-deletion of files from the block will lead to free space fragmentation again.
-there's quite a bit of disk labor involved in moving all the files to one end of the disk esepcially for large volumes.
So, it's not good for volumes where the files are frequently changing.

Some of the more advanced defragmenters have file sequencing algorithms (eg i-faast in Diskeeper 09 pro) that rearrange/consolidate files based on usage frequency. This leads to a block of consolidated frequently used files followed by a chunk of consolidated free space, with the block of least modified files at the very end.
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Old 01-26-2009, 11:16 AM   #7
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Ionicbond,

Thank you for your detailed explanation. I actually read about some of this today on Piriform's Documentation website for Defraggler and in their forums. I didn't know the doc site existed until today. But thanks and I feel much more informed!
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