Well, theoretically it causes some wear of mechanical components... just like any drive opreation.
But if drive doesn't have much fragmentation then defragger shouldn't do much rearrangement of files.
I have it set to do my drive once a week, takes a couple of seconds because it hardly has anything to do, keeps it all in place. If you leave it a long time between defrag then it'll have more work to do etc so I imagine that would put more wear on the mechanical components.
If you run the defragger on volumes that have no or very less fragmentation, it tends to complete in minutes since there isnt much work to do anyways. so I think, there really isnt any risk. I personally use Diskeeper in automatic mode, it defrags whenever required and keeps the drives defragged.
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