hi their a friend of mine (rich and doesnt know what hes doing) has a rig with 10 hdds in and for a while now it has been slow,ive told him to defrag the hdds but he said that it deletes all the files and doesnt make any speed difference (i know it doesnt delete files).how much of a difference would it make if he de fragged it and show him this thread as he doesnt belive me that it makes a difference