i have 3 partitions and the first two (OS and documents) defrag perfectly with no problems. They have 8gb and 5 gb respectively. However, my big e drive doesn't defragment. I contains all my games, ...

How often should you defrag a drive? I know you are suppose to after you move, use, change, or add a large number of files, but at what point does defragging a drive cause more wear and tear than it's ...