What happens when I do "Defrag Freespace"?
And what is the difference with "Defrag Freespace (allow fragmentation)?

There is no helpfile.

See here:

http://forum.piriform.com/index.php?showto...mp;#entry110791

I don't understand the explanation.
I think he uses the word "defragmentation" instead of "fragmentation".

Hello NewHaunter,
Also accept my Welcome to the Forums.

You "understood" my explanation perfectly. It was worded incorrectly.
What can I say about my original post but that you are exactly correct.
I did use the word "defragmentation" three or four times when it should have been "fragmentation".
I have corrected the post. Please check it and see if it makes more sense now.
http://forum.piriform.com/index.php?s=&...st&p=110791

These links are great to learn what "defragmentation" is for and when best to do it. Also covers Free Space fragmentation.
Disk Defragmenter
http://technet.microsoft.com/en-us/library/bb742585.aspx

The Desktop Files The Truth about Defragmentation. Also provides explanation and link to PageDefrag program.
http://technet.microsoft.com/en-us/magazine/cc137767.aspx

I must have "fragmented" my coffee intake too much the morning I created that post.

Good luck,
davey

@davey: Thanks for the links. It's great getting an answer before asking.

@davey,

Thanks for the reply and the links.
Now I understand it better.