what does the benefit of disk defragmentation? coz ive been trying out perfect disk 7 for quite a while now and i dont realy notice any change in speed after defragging my disk. and it takes too long to defrag using Perfect disk my poor disk usually defrags well over 12 hrs. the last time i defrag i think its on 17 hrs but it only completed 90%. i dont really like to put my disk in to that long hours of work. and im just afraid that after all the trouble that my disk went through just to defrag itself il be undoing all its work in a matter of few days. if this is true, its not a really good idea to defrag my disk in the 1st place right? i usually defrag my disk every 2 or 3 weeks. should i do it more often to increase the speed of defragging? and can some explain the results of my defragment? i looks kinda odd and very patchy, with many holes of free space. i dont really know how to interpret that list of colored blocks. and what does the smaller blue and red blocks means? and lastly i have very little space left on my disk only 4 gig left lol! i have 225GB usable (250 Gb) does this have any conflict in defragging? is it very essential to free up some space? thanks a lot, sorry if i have loads of question. il be earnestly waiting for your replies. thanks a lot!