Earlier versions of defrag could be a bit risky with regards to losing data if the system crashed while it was running. XP's defrag is much safer, or you could use a 3rd party defragger like Diskeeper which guarantees no possible data loss.
Defragging regularly keeps the data on the drive in some kind of order making access times quicker. Depending on the size of the drive and how much free space there is, if you defrag once a week it should only take a few minutes each time.
-well personally i consider defrag good. but basing from my experience i defrag our main server then after that users can access the shared drives in the server and the server itself cant delete anything on the shared drives and cant copy either. the access on the shared drives becomes very slow. some of those that i know also agrees that when they defrag their units theres a time that it went slow.
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