I noticed that defraggler used up the disk space for temporary storing files that it is defragmenting,but after it completes defragmenting,it takes a very long time to clear the space it used,and often takes up more than 5GB of disk space.Is there any solution to quickly clear off the space it used?And it seems that sometimes,it isn't even clearing the space...

Same behaviour here. Just install Defraggler, launch defrag on C:\ and finally I lost 5GB !!
Do you know where are Defraggler temp files ??

Thank you.

Can you post details of your OS please

MrRon

Vista Ultimate SP1.

"Stolen" disk space finally get back yesterday. Don't understand what happened.
Now, Defraggler is removed from my hard disk ...