defraging

[joshcowin]

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

 

[joshcowin]

hes running 7 but he had the auto defrag off.ive cleaned all his disks up and it helped a fair bit they are all hdd because again he reckons ssds are a waste of time (sigh!)

 

[joshcowin]

well all i know is that they are wd caviar black 2 tbs and the system specs are
i5 3570k
16gb 1600mhz ram
asus z77 sabertooth mobo
gigabyte 7950
xfx 1000w psu
10 x wd cav black 2tb