limchunghau

Hi, i started using Defraggler just today and notce that when i start the defragment the freespace in my hard disk suddenly decreased drastically. i was defragging my Cdrive with freespace of 53.7GB. but after the defragment. I am left with 30Gb freespace! can anyone answer my question? is it a problem with my computer or the defraggler?? Pls Help!!